#include <strings.h> char *rindex(const char *string, int ch);
Returns a pointer to the last occurrence of ch in string.
Note that the NULL
character counts, so if you pass zero as
ch you'll get a pointer to the end of the string back.
A pointer to the character, or NULL
if it wasn't found.
not ANSI, not POSIX
char *last_slash = rindex(filename, '/');
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