code: def _match_line(self, city_name, lines):
          
          for line in lines:
              toponym = line.split(',')[0]
              if toponym.lower() == city_name.lower():
                  return line.strip()
          return None
docs: The lookup is case insensitive and returns the first matching line,
          stripped.
          :param city_name: str
          :param lines: list of str
          :return: str