strpbrk.c

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