anchor.diff:  int split_words(char *sentence);
   -------------------------------
   
  -...and to get the code to link we need a stub function in 'words.c'...
  +...and to get the code to link we need a stub function in +words.c+...
   
   [source,c]
   -------------------------------
  
positive.code: }
  -------------------------------
  
  Here is the 'all_tests.c' test runner...
  
  [source,c]
  -------------------------------
  
negative.code: }
  -----------------------------
  
  A test is denoted by the macro *Ensure*. You can think of a test as
  having a 'void (void)' signature. You add the test to your suite using
  'add_test()'.
  
  On compiling and running, we now get the output...
  