docs: def _format_name(self, name, surname, snake_case=False):
          """Format a first name and a surname into a cohesive string.
  
          Note that either name or surname can be empty strings, and
          formatting will still succeed.
  
          :param str name: A first name.
          :param str surname: A surname.
          :param bool snake_case: If True, format the name as
              "snake_case", also stripping diacritics if any. (default:
              False)
          :return str: The formatted name.
          """
          if not name or not surname:
              sep = ''
          elif snake_case:
              sep = '_'
          else:
              sep = ' '
  
          if snake_case:
              name = self._snakify_name(name)
              surname = self._snakify_name(surname)
  
          disp_name = '{}{}{}'.format(name, sep, surname)
  
          return disp_name