find_string_in_string.c

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

_Bool find(const char* haystack, const char* needle)
{
    size_t hlen = strlen(haystack);
    size_t nlen = strlen(needle);
    unsigned int found = 0;

    for ( unsigned int i = 0; i < hlen; i++ )
    {
        found = 0;
        for ( unsigned int j = 0; i+j < hlen; j++ )
        {
            if ( haystack[i+j] != needle[j] )
                break;
            else
                found++;
        }
        if ( found == nlen )
            break;
    }

    if ( found == nlen )
        return true;
    else
        return false;

}


int main(void)
{

    printf("%i\n",find("abcdefg","efgh"));
    return 0;
}