#include <stdio.h>
#define STR1 ""
#define STR2 "a"

int	main(void)
{
	char	s1[] = STR1;
	char	s2[] = STR2;
	printf("s1: %s s2: %s\n", s1, s2);
	ft_strcat(s1, s2);
	printf("s1: %s s2: %s\n", s1, s2);
	return (0);
}