code: def command_clean(string, vargs):
      
      valid_chars, invalid_chars = remove_invalid_ipa_characters(
          unicode_string=string,
          return_invalid=True,
          single_char_parsing=vargs["single_char_parsing"]
      )
      print(u"".join(valid_chars))
      print_invalid_chars(invalid_chars, vargs)
docs: Remove characters that are not IPA valid from the given string,
      and print the remaining string.
  
      :param str string: the string to act upon
      :param dict vargs: the command line arguments