code: private static String addSpaces(String value) {
          final int length = value.length();
          final int lastPossibleBlock = length - 4;
          final StringBuilder sb = new StringBuilder(length + (length - 1) / 4);
          int i;
          for (i = 0; i < lastPossibleBlock; i += 4) {
              sb.append(value, i, i + 4);
              sb.append(' ');
          }
          sb.append(value, i, length);
          return sb.toString();
      }
docs: Converts a plain to a pretty printed IBAN
  
  @param value
  plain iban
  @return pretty printed IBAN