#include <stdio.h>
#include <string.h>

int ft_strlen(char *str)
{
    int i;

    i = 0;
    while (str[i])
        i++;
    return (i);
}


char	*ft_strstr(char *str, char *to_find)
{
	int	i;
	int	j;
	int	find_len;

	i = 0;
	find_len = ft_strlen(to_find);

	if (find_len == 0)
		return (str);

	while (str[i] != '\0')
	{
		j = 0;
		if (str[i] == to_find[j])
		{
			while (str[i+j] == to_find[j])
			{
				j++;
				if (j == find_len)
					return (&str[i]);
			}
		}
		i++;
	}
	return (NULL);
}

int main() {
    char str1[] = "i can do this all day";
    char str2[] = "day";

    char *a = ft_strstr(str1, str2);
    printf("%s", a);
    
    return 0;
}