code: def condense(input_string):
      
      try:
          assert isinstance(input_string, basestring)
      except AssertionError:
          raise TypeError
      removed_leading_whitespace = re.sub('>\s+', '>', input_string).strip()
      removed_trailing_whitespace = re.sub('\s+<', '<', removed_leading_whitespace).strip()
      return removed_trailing_whitespace
docs: Trims leadings and trailing whitespace between tags in an html document
  
      Args:
          input_string: A (possible unicode) string representing HTML.
  
      Returns:
          A (possibly unicode) string representing HTML.
  
      Raises:
          TypeError: Raised if input_string isn't a unicode string or string.