Listing 3

original string...
  35A5:0053 -> abcdefghijklmnopqrs
sub-string to be searched...
  35AB:0000 -> nopqrs
character to be found? a
calling strrchr...
  35AB:0006 -> 
  35AB:0005 -> s
  35AB:0004 -> rs
  35AB:0003 -> qrs
  35AB:0002 -> pqrs
  35AB:0001 -> opqrs
  35AB:0000 -> nopqrs
  25AB:FFFF -> m
value returned by strrchr...
  0000:0000 -> NULL