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

int main() { 

    char where[] = "Quand on n'a pas de tete, il faut avoir des jambes.";
    char what1[] = "il";
    char what2[] = "te";
    char *res;

    // strstr function returns a pointer to the FIRST occurrence of 
    // the second string in the first string, or a NULL pointer if 
    // the second string is not present.

    res = strstr(where, what1);
    if (res != NULL)  printf("%s\n", res);
    else printf("%s NOT FOUND.\n", what1);

    res = strstr(where, what2);
    if (res != NULL)  printf("%s\n", res);
    else printf("%s NOT FOUND.\n", what2);

    return 0;
}


/** Output:
 * il faut avoir des jambes.
 * tete, il faut avoir des jambes.
 */