rindex---reverse search for character in string
#include <string.h> char * rindex(const char *string, int c);
This function finds the last occurence of c (converted to a char) in the string pointed to by string (including the terminating null character).
This function is identical to
Returns a pointer to the located character, or a null pointer if c does not occur in string.
rindex requires no supporting OS subroutines.
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