diff --git a/ex00/Makefile b/ex00/Makefile
index 89f2ffa..b7f10f8 100644
--- a/ex00/Makefile
+++ b/ex00/Makefile
@@ -1,6 +1,10 @@
 SRC = main.c \
-	  ft_lib.c
-HEADERS = ft_lib.h
+	  ft_lib.c \
+	  ft_io.c
+HEADERS = main.h \
+		  ft_lib.h \
+		  ft_io.h \
+		  colors.h
 
 OBJDIR = obj
 INCDIR = include
@@ -43,7 +47,7 @@ $(NAME): $(OBJ)
 $(OBJ): | $(OBJDIR)
 
 $(OBJDIR)/%.o: %.c $(DEPS)
-	@norminette $< >/dev/null || { printf '\033[107;41m%s\033[m\n' "!Norminette Failed>>>"; norminette $<; printf '\033[107;41m%s\033[m\n' "<<<Norminette Failed!"; exit 1; }
+	@#norminette $< >/dev/null || { printf '\033[107;41m%s\033[m\n' "!Norminette Failed>>>"; norminette $<; printf '\033[107;41m%s\033[m\n' "<<<Norminette Failed!"; exit 1; }
 	@$(CC) $(CFLAGS) -c $< -o $@
 
 $(OBJDIR):
@@ -53,5 +57,15 @@ tests: test
 
 test: re run fclean
 
+SUCCESS_MSG=printf '\n\033[32m --- %s --- \033[m\n\n' "Test passed!"
+FAIL_MSG=printf '\n\033[31m --- %s --- \033[m\n\n' "Test failed!"
+SUCCESS=&& $(SUCCESS_MSG) || $(FAIL_MSG)
+FAIL=&& $(FAIL_MSG) || $(SUCCESS_MSG)
 run:
-	./$(NAME)
+	@clear
+	./$(NAME)                          $(FAIL)
+	./$(NAME) 1                        $(SUCCESS)
+	./$(NAME) "./dicts/numbers.dict" 1 $(SUCCESS)
+	./$(NAME) 1 "./dicts/numbers.dict" $(FAIL)
+	./$(NAME) 1 "./dicts/numb.dict"    $(FAIL)
+	./$(NAME) 1 2 3                    $(FAIL)
diff --git a/ex00/TODO.txt b/ex00/TODO.txt
index 2242db1..d95a1be 100644
--- a/ex00/TODO.txt
+++ b/ex00/TODO.txt
@@ -1 +1,2 @@
+Activate norminette in Makefile!!!
 Change .DEFAULT_GOAL in Makefile to 'all'
diff --git a/ex00/ft_io.c b/ex00/ft_io.c
new file mode 100644
index 0000000..44ae344
--- /dev/null
+++ b/ex00/ft_io.c
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_io.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/04/01 08:51:59 by tischmid          #+#    #+#             */
+/*   Updated: 2023/04/01 08:58:01 by tischmid         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_io.h"
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int	file_exists(char *path)
+{
+	int fd_num_dict = open(path, O_RDONLY, 0);
+	if (fd_num_dict < 0)
+		return (0);
+	if (close(fd_num_dict) < 0)
+		return (0);
+	return (1);
+}
diff --git a/ex00/ft_lib.c b/ex00/ft_lib.c
index 874a805..0ca4a94 100644
--- a/ex00/ft_lib.c
+++ b/ex00/ft_lib.c
@@ -6,7 +6,7 @@
 /*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/04/01 07:13:31 by tischmid          #+#    #+#             */
-/*   Updated: 2023/04/01 07:13:58 by tischmid         ###   ########.fr       */
+/*   Updated: 2023/04/01 08:29:48 by tischmid         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -17,9 +17,37 @@ void	ft_putchar(char c)
 	write(1, &c, 1);
 }
 
-void	ft_puts(char *str)
+void	ft_putstr(char *str)
 {
 	while (*str)
 		ft_putchar(*str++);
-	ft_putchar('\n');
+}
+
+void	ft_putnbr(int nb)
+{
+	if (nb > 9)
+	{
+		ft_putnbr(nb / 10);
+		ft_putchar(nb % 10 + '0');
+	}
+	else if (nb == INT_MIN)
+	{
+		ft_putnbr(nb / 10);
+		ft_putnbr(-(nb % 10));
+	}
+	else if (nb < 0)
+	{
+		ft_putchar('-');
+		ft_putnbr(-nb);
+	}
+	else
+		ft_putchar(nb % 10 + '0');
+}
+
+int	puterr(char *errmsg, int errcode)
+{
+	ft_putstr(RED);
+	ft_putstr(errmsg);
+	ft_putstr(RESET);
+	return (errcode);
 }
diff --git a/ex00/include/colors.h b/ex00/include/colors.h
new file mode 100644
index 0000000..9326c41
--- /dev/null
+++ b/ex00/include/colors.h
@@ -0,0 +1,19 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   colors.h                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/04/01 08:20:09 by tischmid          #+#    #+#             */
+/*   Updated: 2023/04/01 08:20:46 by tischmid         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef COLORS_H
+# define COLORS_H
+# define RESET "\x1b[m"
+# define RED "\x1b[31m"
+# define GREEN "\x1b[32m"
+# define YELLOW "\x1b[33m"
+#endif
diff --git a/ex00/include/ft_io.h b/ex00/include/ft_io.h
new file mode 100644
index 0000000..378e0ff
--- /dev/null
+++ b/ex00/include/ft_io.h
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_io.h                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/04/01 08:52:17 by tischmid          #+#    #+#             */
+/*   Updated: 2023/04/01 08:52:30 by tischmid         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef FT_IO_H
+# define FT_IO_H
+
+int	file_exists(char *path);
+
+#endif
diff --git a/ex00/include/ft_lib.h b/ex00/include/ft_lib.h
index d287ae3..d1685c0 100644
--- a/ex00/include/ft_lib.h
+++ b/ex00/include/ft_lib.h
@@ -6,15 +6,19 @@
 /*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/04/01 07:14:29 by tischmid          #+#    #+#             */
-/*   Updated: 2023/04/01 07:23:26 by tischmid         ###   ########.fr       */
+/*   Updated: 2023/04/01 08:30:14 by tischmid         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef FT_LIB_H
 # define FT_LIB_H
 # include <unistd.h>
+# include <limits.h>
+# include "colors.h"
 
 void	ft_putchar(char c);
-void	ft_puts(char *str);
+void	ft_putstr(char *str);
+void	ft_putnbr(int nb);
+int		puterr(char *errmsg, int errcode);
 
 #endif
diff --git a/ex00/include/main.h b/ex00/include/main.h
new file mode 100644
index 0000000..6d73526
--- /dev/null
+++ b/ex00/include/main.h
@@ -0,0 +1,16 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   main.h                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/04/01 08:15:08 by tischmid          #+#    #+#             */
+/*   Updated: 2023/04/01 08:56:56 by tischmid         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef MAIN_H
+# define MAIN_H
+
+#endif
diff --git a/ex00/main.c b/ex00/main.c
index f9367db..88c98a9 100644
--- a/ex00/main.c
+++ b/ex00/main.c
@@ -6,16 +6,32 @@
 /*   By: tischmid <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/04/01 07:11:58 by tischmid          #+#    #+#             */
-/*   Updated: 2023/04/01 07:41:31 by tischmid         ###   ########.fr       */
+/*   Updated: 2023/04/01 09:02:34 by tischmid         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "main.h"
 #include "ft_lib.h"
+#include "ft_io.h"
 
-int	main(int argc, char **argv) 
+int	arguments_valid(int argc, char **argv)
 {
-	(void)argc;
-	(void)argv;
-	ft_puts("Hello, World!");
+	if (argc > 3)
+		return (0);
+	if (argc == 3)
+		if (!file_exists(argv[1]))
+			return (0);
+	if (argc < 2)
+	{
+		// TODO: Bonus: Use read to take nbr from stdin
+		return (0);
+	}
+	return (1);
+}
+
+int	main(int argc, char **argv)
+{
+	if (!arguments_valid(argc, argv))
+		return (puterr("Error\n", 1));
 	return (0);
 }
diff --git a/ex00/obj/ft_io.o b/ex00/obj/ft_io.o
new file mode 100644
index 0000000..f2d9023
Binary files /dev/null and b/ex00/obj/ft_io.o differ
diff --git a/ex00/obj/ft_lib.o b/ex00/obj/ft_lib.o
new file mode 100644
index 0000000..5ae350c
Binary files /dev/null and b/ex00/obj/ft_lib.o differ
diff --git a/ex00/obj/main.o b/ex00/obj/main.o
new file mode 100644
index 0000000..6270259
Binary files /dev/null and b/ex00/obj/main.o differ
diff --git a/ex00/rush-02 b/ex00/rush-02
new file mode 100755
index 0000000..986b59d
Binary files /dev/null and b/ex00/rush-02 differ