code: public static String removeFirstWord(String sentence)
    {
      if(sentence == null) {
        return null;
      }
      if(sentence.isEmpty()) {
        return sentence;
      }
  
      String firstWord = firstWord(sentence);
      if(firstWord.length() == sentence.length()) return sentence;
  
      int i = firstWord.length();
      for(; i < sentence.length(); i++) {
        if(WHITE_SPACES.indexOf(sentence.charAt(i)) == -1) break;
      }
      return sentence.substring(i);
    }
docs: Remove first word from a sentence. First word is recognized using the heuristic from {@link #firstWord(String)}.
  White spaces after first word are also trimmed. For the purpose of this function white spaces are: space, tab,
  carriage return, line feed, point, comma, colon and semicolon.
  <p>
  This method returns null if <code>sentence</code> argument is null and empty if empty.
  
  @param sentence sentence to remove first word from.
  @return the sentence with first word removed.