strrchr —
locate character in string
Standard C Library (libc, -lc)
#include <string.h>
char *
  
  strrchr(const
    char *s, int
  c);
The strrchr() function locates the last occurrence of
  c (converted to a char) in the string
  s. If c is
  ‘\0’, strrchr()
  locates the terminating ‘\0’.
The strrchr() function returns a pointer to the
  character, or a null pointer if c does not occur
  anywhere in s.
After the following call to strrchr(),
  p will point to the string “obar”:
char *p;
char *s = "foobar";
p = strrchr(s, 'o');
 
The strrchr() function conforms to ANSI
  X3.159-1989 (“ANSI C89”).