rindex() - locate character in string
#include <strings.h>
char * rindex (const char *s, int c)
The rindex(3) function locates the last character matching c (converted to a char) in the null-terminated string s.
A pointer to the character is returned if it is found; otherwise
NULL is returned. If c is \0, rindex(3)
locates the terminating \0.
index(3)
memchr(3)
strchr(3)
strcspn(3)
strpbrk(3)
strrchr(3)
strsep(3)
strspn(3)
strstr(3)
strtok(3)
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