code: public String normalize(String input, Language language) {
        if (input == null) {
           return null;
        }
        String finalString = input;
        for (TextNormalizer textNormalizer : preprocessors) {
           finalString = textNormalizer.apply(finalString, language);
        }
        return finalString;
     }
docs: Normalizes a string with a number of text normalizers.
  
  @param input    The input string
  @param language The language of the input string
  @return A normalized version of the string