code: public static String rTrim(final String value) {
          if (value == null) {
              return null;
          }
  
          String trimmed = value;
          int offset = value.length() - 1;
          while (offset > -1 && (value.charAt(offset) == ' ' || value.charAt(offset) == '\t')) {
              offset--;
          }
  
          if (offset < value.length() - 1) {
              trimmed = value.substring(0, offset + 1);
          }
  
          return trimmed;
      }
docs: Removes empty space from the end of a string
  
  @param value -
  to be trimmed
  @return String