strpbrk---find chars in string
#include <string.h> char *strpbrk(const char *s1, const char *s2);
This function locates the first occurence in the string pointed to by s1 of any character in string pointed to by s2 (excluding the terminating null character).
strpbrk returns a pointer to the character found in s1, or a
null pointer if no character from s2 occurs in s1.
strpbrk requires no supporting OS subroutines.
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