strstr.c

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#include <string.h>
 
char* strstr(const char* s1, const char* s2)
{
    const char* p1 = s1;
    const char* p2;
 
    while (*s1)
    {
        p2 = s2;
 
        while (*p2 && (*p1 == *p2))
        {
            ++p1;
            ++p2;
        }
 
        if (!*p2)
        {
            return (char*)s1;
        }
 
        ++s1;
        p1 = s1;
    }
 
    return NULL;
}