strstr---find string segment
#include <string.h> char *strstr(const char *s1, const char *s2);
Locates the first occurence in the string pointed to by s1 of the sequence of characters in the string pointed to by s2 (excluding the terminating null character).
Returns a pointer to the located string segment, or a null pointer if the string s2 is not found. If s2 points to a string with zero length, the s1 is returned.
strstr is ANSI C.
strstr requires no supporting OS subroutines.
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