diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b55e0c2
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,91 @@
+CC = cc
+CFLAGS = -Wall -Wextra -Werror
+LDFLAGS =
+AR = ar rcs
+RM = /bin/rm -f
+
+NAME = libft.a
+OBJDIR = .
+SRCDIR = .
+INCDIR = .
+
+unexport _SRC
+_SRC += ft_atoi.c
+_SRC += ft_bzero.c
+_SRC += ft_calloc.c
+_SRC += ft_isalnum.c
+_SRC += ft_isalpha.c
+_SRC += ft_isascii.c
+_SRC += ft_isdigit.c
+_SRC += ft_isprint.c
+_SRC += ft_isspace.c
+_SRC += ft_memchr.c
+_SRC += ft_memcmp.c
+_SRC += ft_memcpy.c
+_SRC += ft_memmove.c
+_SRC += ft_memset.c
+_SRC += ft_strchr.c
+_SRC += ft_strdup.c
+_SRC += ft_strlcat.c
+_SRC += ft_strlcpy.c
+_SRC += ft_strlen.c
+_SRC += ft_strncmp.c
+_SRC += ft_strnstr.c
+_SRC += ft_strrchr.c
+_SRC += ft_tolower.c
+_SRC += ft_toupper.c
+# _SRC += ft_putchar_fd.c
+# _SRC += ft_putendl_fd.c
+# _SRC += ft_putnbr_fd.c
+# _SRC += ft_putstr_fd.c
+
+# _SRC += ft_itoa.c
+# _SRC += ft_strtrim.c
+_SRC += ft_substr.c
+# _SRC += ft_strjoin.c
+# _SRC += ft_split.c
+# _SRC += ft_striteri.c
+# _SRC += ft_strmapi.c
+
+# _SRC += ft_lstadd_back.c
+# _SRC += ft_lstadd_front.c
+# _SRC += ft_lstclear
+# _SRC += ft_lstdelone.c
+# _SRC += ft_lstiter.c
+# _SRC += ft_lstlast.c
+# _SRC += ft_lstmap.c
+# _SRC += ft_lstnew.c
+# _SRC += ft_lstsize.c
+
+unexport _DEPS
+_DEPS += libft.h
+
+_OBJ = $(_SRC:.c=.o)
+
+OBJ = $(addprefix $(OBJDIR)/,$(_OBJ))
+SRC = $(addprefix $(SRCDIR)/,$(_SRC))
+DEPS = $(addprefix $(INCDIR)/,$(_DEPS))
+
+so:
+	$(CC) -nostartfiles -fPIC $(CFLAGS) $(SRC)
+	gcc -nostartfiles -shared -o libft.so $(OBJ)
+
+all: $(NAME)
+
+$(NAME): $(OBJ)
+	$(AR) $@ $^
+
+$(OBJDIR)/%.o: %c $(DEPS)
+	$(CC) $(CFLAGS) -c -o $@ -I$(INCDIR) $<
+
+clean:
+	$(RM) $(OBJ)
+
+fclean: clean
+	$(RM) $(NAME)
+
+re: fclean all
+
+bonus: all
+
+.PHONY: re fclean clean all bonus
diff --git a/a.out b/a.out
new file mode 100755
index 0000000..5596abd
Binary files /dev/null and b/a.out differ
diff --git a/ft_atoi.c b/ft_atoi.c
new file mode 100644
index 0000000..ea6e9a3
--- /dev/null
+++ b/ft_atoi.c
@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_atoi.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 17:28:18 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 17:28:18 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isspace(int c);
+int	ft_isdigit(int c);
+
+int	ft_atoi(const char *nptr)
+{
+	int	res;
+	int	sign;
+
+	while (ft_isspace(*nptr++))
+		;
+	sign = 1;
+	if (*--nptr == '+' || *nptr == '-')
+		if (*nptr++ == '-')
+			sign = -1;
+	res = 0;
+	while (ft_isdigit(*nptr))
+		res = res * 10 + *nptr++ - '0';
+	return (sign * res);
+}
diff --git a/ft_atoi.o b/ft_atoi.o
new file mode 100644
index 0000000..a66baf1
Binary files /dev/null and b/ft_atoi.o differ
diff --git a/ft_bzero.c b/ft_bzero.c
new file mode 100644
index 0000000..6c1ed1a
--- /dev/null
+++ b/ft_bzero.c
@@ -0,0 +1,19 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_bzero.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 11:55:27 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 11:55:28 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+void	ft_bzero(void *s, size_t n)
+{
+	while (n--)
+		*(char *) s++ = (unsigned char) 0;
+}
diff --git a/ft_bzero.o b/ft_bzero.o
new file mode 100644
index 0000000..748546e
Binary files /dev/null and b/ft_bzero.o differ
diff --git a/ft_calloc.c b/ft_calloc.c
new file mode 100644
index 0000000..8f17e0f
--- /dev/null
+++ b/ft_calloc.c
@@ -0,0 +1,37 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_calloc.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 17:39:55 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 17:39:56 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+#include <limits.h>
+
+void	ft_bzero(void *s, size_t n);
+
+void	*ft_calloc(size_t nmemb, size_t size)
+{
+	void	*ret;
+	void	*empty;
+
+	if (nmemb * size == 0)
+	{
+		empty = malloc(0);
+		if (!empty)
+			return (0);
+		return (empty);
+	}
+	if (UINT_MAX / nmemb < size)
+		return (0);
+	ret = malloc(nmemb * size);
+	if (!ret)
+		return (0);
+	ft_bzero(ret, nmemb * size);
+	return (ret);
+}
diff --git a/ft_calloc.o b/ft_calloc.o
new file mode 100644
index 0000000..91213ea
Binary files /dev/null and b/ft_calloc.o differ
diff --git a/ft_isalnum.o b/ft_isalnum.o
new file mode 100644
index 0000000..e154d47
Binary files /dev/null and b/ft_isalnum.o differ
diff --git a/ft_isalpha.o b/ft_isalpha.o
new file mode 100644
index 0000000..dcf3c8c
Binary files /dev/null and b/ft_isalpha.o differ
diff --git a/ft_isascii.o b/ft_isascii.o
new file mode 100644
index 0000000..0e03552
Binary files /dev/null and b/ft_isascii.o differ
diff --git a/ft_isdigit.o b/ft_isdigit.o
new file mode 100644
index 0000000..bfc0bfb
Binary files /dev/null and b/ft_isdigit.o differ
diff --git a/ft_isprint.o b/ft_isprint.o
new file mode 100644
index 0000000..6a2f7b9
Binary files /dev/null and b/ft_isprint.o differ
diff --git a/ft_isspace.c b/ft_isspace.c
new file mode 100644
index 0000000..ae805a8
--- /dev/null
+++ b/ft_isspace.c
@@ -0,0 +1,21 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isspace.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 17:38:55 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 17:39:02 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isspace(int c)
+{
+	return (c == ' '
+		|| c == '\n'
+		|| c == '\r'
+		|| c == '\t'
+		|| c == '\f'
+		|| c == '\v');
+}
diff --git a/ft_isspace.o b/ft_isspace.o
new file mode 100644
index 0000000..e96eb9c
Binary files /dev/null and b/ft_isspace.o differ
diff --git a/ft_itoa.c b/ft_itoa.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstadd_back.c b/ft_lstadd_back.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstadd_front.c b/ft_lstadd_front.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstclear b/ft_lstclear
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstdelone.c b/ft_lstdelone.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstiter.c b/ft_lstiter.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstlast.c b/ft_lstlast.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstmap.c b/ft_lstmap.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstnew.c b/ft_lstnew.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_lstsize.c b/ft_lstsize.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_memchr.c b/ft_memchr.c
new file mode 100644
index 0000000..2689fc9
--- /dev/null
+++ b/ft_memchr.c
@@ -0,0 +1,24 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 16:34:06 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 16:34:06 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+void	*ft_memchr(const void *s, int c, size_t n)
+{
+	unsigned char	*us;
+
+	us = (unsigned char *) s;
+	while (n--)
+		if (*us++ == (unsigned char) c)
+			return (--us);
+	return (0);
+}
diff --git a/ft_memchr.o b/ft_memchr.o
new file mode 100644
index 0000000..a940e2c
Binary files /dev/null and b/ft_memchr.o differ
diff --git a/ft_memcmp.c b/ft_memcmp.c
new file mode 100644
index 0000000..9c5bd86
--- /dev/null
+++ b/ft_memcmp.c
@@ -0,0 +1,28 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcmp.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 16:44:15 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 16:44:15 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+int	ft_memcmp(const void *s1, const void *s2, size_t n)
+{
+	unsigned char	*us1;
+	unsigned char	*us2;
+
+	us1 = (unsigned char *) s1;
+	us2 = (unsigned char *) s2;
+	if (!n)
+		return (0);
+	while (n--)
+		if (*us1++ != *us2++)
+			return (*--us1 - *--us2);
+	return (0);
+}
diff --git a/ft_memcmp.o b/ft_memcmp.o
new file mode 100644
index 0000000..0b59749
Binary files /dev/null and b/ft_memcmp.o differ
diff --git a/ft_memcpy.c b/ft_memcpy.c
new file mode 100644
index 0000000..b1e1f66
--- /dev/null
+++ b/ft_memcpy.c
@@ -0,0 +1,27 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcpy.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 13:28:20 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 13:28:21 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+void	*ft_memcpy(void *dest, const void *src, size_t n)
+{
+	char		*d;
+	const char	*s;
+
+	if (!src && !dest)
+		return (0);
+	d = dest;
+	s = src;
+	while (n--)
+		*d++ = *s++;
+	return (dest);
+}
diff --git a/ft_memcpy.o b/ft_memcpy.o
new file mode 100644
index 0000000..39fc966
Binary files /dev/null and b/ft_memcpy.o differ
diff --git a/ft_memmove.c b/ft_memmove.c
new file mode 100644
index 0000000..372c400
--- /dev/null
+++ b/ft_memmove.c
@@ -0,0 +1,32 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memmove.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 16:19:10 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 16:19:11 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+#include <stddef.h>
+
+void	*ft_memmove(void *dest, const void *src, size_t n)
+{
+	char		*d;
+	const char	*s;
+
+	if (!src && !dest)
+		return (0);
+	d = dest;
+	s = src;
+	if (src >= dest)
+		while (n--)
+			*d++ = *s++;
+	else
+		while (n--)
+			*(d + n) = *(s + n);
+	return (dest);
+}
diff --git a/ft_memmove.o b/ft_memmove.o
new file mode 100644
index 0000000..99a0ff5
Binary files /dev/null and b/ft_memmove.o differ
diff --git a/ft_memset.c b/ft_memset.c
new file mode 100644
index 0000000..f07fa9f
--- /dev/null
+++ b/ft_memset.c
@@ -0,0 +1,23 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memset.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 10:06:42 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 10:06:42 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+void	*ft_memset(void *s, int c, unsigned long n)
+{
+	unsigned char	*ptr;
+
+	ptr = (unsigned char *) s;
+	while (n-- > 0)
+		*ptr++ = c;
+	return (s);
+}
diff --git a/ft_memset.o b/ft_memset.o
new file mode 100644
index 0000000..57bee77
Binary files /dev/null and b/ft_memset.o differ
diff --git a/ft_putchar_fd.c b/ft_putchar_fd.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_putendl_fd.c b/ft_putendl_fd.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_putnbr_fd.c b/ft_putnbr_fd.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_putstr_fd.c b/ft_putstr_fd.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_split.c b/ft_split.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_strchr.c b/ft_strchr.c
new file mode 100644
index 0000000..13aec53
--- /dev/null
+++ b/ft_strchr.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 16:20:31 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 16:20:33 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+char	*ft_strchr(const char *s, int c)
+{
+	while (*s)
+		if (*s++ == (unsigned char) c)
+			return ((char *)--s);
+	if (*s == (unsigned char) c)
+		return ((char *) s);
+	else
+		return (0);
+}
diff --git a/ft_strchr.o b/ft_strchr.o
new file mode 100644
index 0000000..3c234fc
Binary files /dev/null and b/ft_strchr.o differ
diff --git a/ft_strdup.c b/ft_strdup.c
new file mode 100644
index 0000000..67f05db
--- /dev/null
+++ b/ft_strdup.c
@@ -0,0 +1,29 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strdup.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 19:12:24 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 19:15:06 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+
+size_t	ft_strlen(const char *s);
+size_t	ft_strlcpy(char *dst, const char *src, size_t size);
+
+char	*ft_strdup(const char *s)
+{
+	char	*s2;
+	size_t	len;
+
+	len = ft_strlen(s);
+	s2 = malloc(sizeof(char) * (len + 1));
+	if (!s2)
+		return (0);
+	ft_strlcpy(s2, (char *) s, len + 1);
+	return (s2);
+}
diff --git a/ft_strdup.o b/ft_strdup.o
new file mode 100644
index 0000000..eaca3d6
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diff --git a/ft_striteri.c b/ft_striteri.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_strjoin.c b/ft_strjoin.c
new file mode 100644
index 0000000..973af94
--- /dev/null
+++ b/ft_strjoin.c
@@ -0,0 +1,27 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strjoin.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/24 13:43:29 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/24 13:43:30 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strjoin(char const *s1, char const s2)
+{
+	size_t	total_len;
+	char	*joined_str;
+
+	total_len = ft_strlen(s1) + ft_strlen(s2);
+	joined_str = ft_calloc(sizeof(char) * (total_len + 1));
+	if (!joined_str)
+		return (0);
+	ft_strlcpy(joined_str, s1, total_len);
+	ft_strlcat(joined_str, s2, total_len);
+	return (joined_str);
+}
diff --git a/ft_strlcat.c b/ft_strlcat.c
new file mode 100644
index 0000000..5be81cc
--- /dev/null
+++ b/ft_strlcat.c
@@ -0,0 +1,68 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlcat.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 16:55:00 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 16:55:01 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+size_t	ft_strlcat(char *dst, const char *src, size_t size)
+{
+	size_t	idx;
+	size_t	slen;
+	size_t	dlen;
+
+	idx = 0;
+	while (dst[idx])
+		++idx;
+	dlen = idx;
+	if (dlen > size)
+		return (size);
+	slen = 0;
+	while (src[slen])
+		dst[idx++] = src[slen++];
+	return (dlen + slen);
+}
+
+// #include <bsd/string.h>
+// #include <stdio.h>
+// int main()
+// {
+//	 printf("%d", ft_strlcat());
+//	 printf("%d", ft_strlcat());
+//	 return (0);
+// }
+
+/*
+Alternative implementation
+size_t	ft_strlcat(char *dst, const char *src, size_t size)
+{
+	size_t	dst_len;
+	size_t	src_len;
+
+	if ((!dst || !src) && size == 0)
+		return (0);
+	dst_len = 0;
+	src_len = -1;
+	while (*dst++)
+		++dst_len;
+	while (src[++src_len])
+		;
+	if (size <= dst_len)
+		return (size + src_len);
+	if (--dst && dst_len > size)
+		return (size + dst_len);
+	while (src_len-- && ++dst_len < size)
+		*dst++ = *src++;
+	if (dst_len-- == size)
+		--dst_len;
+	*dst = 0;
+	return (dst_len + src_len);
+}
+*/
diff --git a/ft_strlcat.o b/ft_strlcat.o
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diff --git a/ft_strlcpy.c b/ft_strlcpy.c
new file mode 100644
index 0000000..693e972
--- /dev/null
+++ b/ft_strlcpy.c
@@ -0,0 +1,29 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlcpy.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 16:55:00 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 16:55:01 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+size_t	ft_strlcpy(char *dst, const char *src, size_t size)
+{
+	char	*d;
+	size_t	len;
+
+	d = dst;
+	len = 0;
+	while (++len < size && *src)
+		*d++ = *src++;
+	if (size)
+		*d = 0;
+	while (*src && src++)
+		len++;
+	return (len - 1);
+}
diff --git a/ft_strlcpy.o b/ft_strlcpy.o
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diff --git a/ft_strlen.o b/ft_strlen.o
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index 0000000..839e175
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diff --git a/ft_strmapi.c b/ft_strmapi.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_strncmp.c b/ft_strncmp.c
new file mode 100644
index 0000000..ecdcfea
--- /dev/null
+++ b/ft_strncmp.c
@@ -0,0 +1,34 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strncmp.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 16:29:43 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 16:29:44 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+#include <stdio.h>
+
+int	ft_strncmp(const char *s1, const char *s2, size_t n)
+{
+	unsigned char	*us1;
+	unsigned char	*us2;
+
+	if (!n)
+		return (0);
+	us1 = (unsigned char *) s1;
+	us2 = (unsigned char *) s2;
+	while (*us1 && *us2 && *us1 == *us2 && --n)
+	{
+		us1++;
+		us2++;
+	}
+	if (*us1 != *us2)
+		return ((*us1 - *us2 != 0)
+			* (-2 * (*us1 - *us2 < 0) + 1));
+	return (0);
+}
diff --git a/ft_strncmp.o b/ft_strncmp.o
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diff --git a/ft_strnstr.c b/ft_strnstr.c
new file mode 100644
index 0000000..4d3b540
--- /dev/null
+++ b/ft_strnstr.c
@@ -0,0 +1,38 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strnstr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 17:05:27 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 17:05:28 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stddef.h>
+
+size_t	ft_strlen(const char *s);
+int		ft_memcmp(const void *s1, const void *s2, size_t n);
+
+char	*ft_strnstr(const char *big, const char *little, size_t len)
+{
+	size_t	l_len;
+	size_t	b_len;
+
+	if ((!big || !little) && len == 0)
+		return (0);
+	b_len = ft_strlen(big);
+	l_len = ft_strlen(little);
+	if (b_len < l_len || len < l_len)
+		return (0);
+	if (b_len - l_len + 1 < len)
+		len = b_len - l_len + 1;
+	else if (len >= l_len)
+		len = len - l_len;
+	len += !len;
+	while (len--)
+		if (!ft_memcmp(big++, little, l_len))
+			return ((char *)--big);
+	return (0);
+}
diff --git a/ft_strnstr.o b/ft_strnstr.o
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diff --git a/ft_strrchr.c b/ft_strrchr.c
new file mode 100644
index 0000000..836b795
--- /dev/null
+++ b/ft_strrchr.c
@@ -0,0 +1,24 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strrchr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 16:24:42 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 16:24:42 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+char	*ft_strrchr(const char *s, int c)
+{
+	char	*last;
+
+	last = 0;
+	while (*s)
+		if (*s++ == (char) c)
+			last = (char *)(s - 1);
+	if (*s == (char) c)
+		return ((char *) s);
+	return (last);
+}
diff --git a/ft_strrchr.o b/ft_strrchr.o
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diff --git a/ft_strtrim.c b/ft_strtrim.c
new file mode 100644
index 0000000..e69de29
diff --git a/ft_substr.c b/ft_substr.c
new file mode 100644
index 0000000..52339e5
--- /dev/null
+++ b/ft_substr.c
@@ -0,0 +1,43 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_substr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/24 13:23:00 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/24 13:23:01 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+
+void	*ft_calloc(size_t nmemb, size_t size);
+size_t	ft_strlcpy(char *dst, const char *src, size_t size);
+
+char	*ft_substr(char const *s, unsigned int start, size_t len)
+{
+	unsigned int	idx;
+	size_t			real_len;
+	char			*substr;
+	char			*empty;
+
+	idx = -1;
+	while (s[++idx] && idx < start)
+		;
+	if (!s[idx])
+	{
+		empty = ft_calloc(1, sizeof(char));
+		if (!empty)
+			return (0);
+		return (empty);
+	}
+	real_len = 0;
+	while (++real_len <= len && s[idx + real_len - 1])
+		;
+	substr = malloc(sizeof(char) * real_len);
+	if (!substr)
+		return (0);
+	ft_strlcpy(substr, s + idx, real_len);
+	return (substr);
+}
diff --git a/ft_substr.o b/ft_substr.o
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diff --git a/ft_tolower.c b/ft_tolower.c
new file mode 100644
index 0000000..f4039ae
--- /dev/null
+++ b/ft_tolower.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_tolower.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/16 14:37:20 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/16 14:37:40 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return (c + 32);
+	return (c);
+}
diff --git a/ft_tolower.o b/ft_tolower.o
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diff --git a/ft_toupper.c b/ft_toupper.c
new file mode 100644
index 0000000..69b0936
--- /dev/null
+++ b/ft_toupper.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_toupper.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/22 16:12:47 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/22 16:12:47 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_toupper(int c)
+{
+	if (c >= 'a' && c <= 'z')
+		return (c - 32);
+	return (c);
+}
diff --git a/ft_toupper.o b/ft_toupper.o
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diff --git a/libft.a b/libft.a
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diff --git a/libft.h b/libft.h
new file mode 100644
index 0000000..41676aa
--- /dev/null
+++ b/libft.h
@@ -0,0 +1,50 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   libft.h                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tosuman <timo42@proton.me>                 +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/05/11 11:31:44 by tosuman           #+#    #+#             */
+/*   Updated: 2023/05/11 11:31:46 by tosuman          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef LIBFT_H
+# define LIBFT_H
+
+# include <stddef.h>
+
+int		ft_atoi(const char *nptr);
+void	ft_bzero(void *s, size_t n);
+void	*ft_calloc(size_t nmemb, size_t size);
+int		ft_isalnum(int c);
+int		ft_isalpha(int c);
+int		ft_isascii(int c);
+int		ft_isdigit(int c);
+int		ft_isprint(int c);
+int		ft_isspace(int c);
+void	*ft_memchr(const void *s, int c, size_t n);
+int		ft_memcmp(const void *s1, const void *s2, size_t n);
+void	*ft_memcpy(void *dest, const void *src, size_t n);
+void	*ft_memmove(void *dest, const void *src, size_t n);
+void	*ft_memset(void *s, int c, size_t n);
+char	*ft_strchr(const char *s, int c);
+char	*ft_strdup(const char *s);
+size_t	ft_strlcat(char *dst, const char *src, size_t size);
+size_t	ft_strlcpy(char *dst, const char *src, size_t size);
+size_t	ft_strlen(const char *s);
+int		ft_strncmp(const char *s1, const char *s2, size_t n);
+char	*ft_strnstr(const char *big, const char *little, size_t len);
+char	*ft_strrchr(const char *s, int c);
+int		ft_tolower(int c);
+int		ft_toupper(int c);
+char	*ft_substr(char const *s, unsigned int start, size_t len);
+
+typedef struct s_list
+{
+	void			*content;
+	struct s_list	*next;
+}					t_list;
+
+#endif
diff --git a/libft.so b/libft.so
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