docs: def highlight_differences(s1, s2, color):
      """Highlight the characters in s2 that differ from those in s1."""
      ls1, ls2 = len(s1), len(s2)
  
      diff_indices = [i for i, (a, b) in enumerate(zip(s1, s2)) if a != b]
  
      print(s1)
  
      if ls2 > ls1:
          colorise.cprint('_' * (ls2-ls1), fg=color)
      else:
          print()
  
      colorise.highlight(s2, indices=diff_indices, fg=color, end='')
  
      if ls1 > ls2:
          colorise.cprint('_' * (ls1-ls2), fg=color)
      else:
          print()