Declaration:
char *strstr(const char *str1,
const char *str2);
Finds the first occurrence of the entire string str2 (not
including the terminating null character) which appears in the
string str1.
Returns a pointer to the first occurrence of str2 in
str1. If no match was found, then a null pointer is
returned. If str2 points to a string of zero length, then
the argument str1 is returned.
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