code: public StringProcessChain trimAllWhitespace() {
  
      if (!StringUtils.isEmpty(source) && StringUtils.containsWhitespace(source)) {
        int sourceLength = source.length();
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < sourceLength; i++) {
          char charAt = source.charAt(i);
          if (!Character.isWhitespace(charAt)) {
            stringBuilder.append(charAt);
          }
        }
        source = stringBuilder.toString();
      }
      return this;
    }
docs: Trim all white space in the given string.<br>
  If given source string self if it's null or length == 0 or not have white
  space.
  
  @return a new string has been removed all white space if given source
  string have white space; given source string self otherwise.