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#include <string.h>
#include "_assert.h"
/** count matching characters **/
char * strpbrk(const char *s1, const char *s2)
{
size_t i;
ASSERT_NONNULL(s1);
ASSERT_NONNULL(s2);
for (i = 0; i < strlen (s1); i++) {
if (strchr(s2, s1[i]) != NULL) {
return (char*)s1 + i;
}
}
return NULL;
}
/***
locates the first occurence in ARGUMENT(s1) of any character in ARGUMENT(s2).
***/
/*
RETURN_FAILURE(CONSTANT(NULL));
RETURN_SUCCESS(a pointer to the located character);
STDC(1)
*/
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