normalize method

@override String normalize(String data)

Implementation

@override
String normalize(String data) {
  if (fixedLength != null) {
    return checkLength(zeroPrepend ? data.padRight(minLength, "0").substring(0, minLength) : data, maxLength);
  }

  if (zeroPrepend && ((data.length % 2 != 0) != addChecksum)) {
    data = "0$data";
  }

  if (addChecksum) {
    data += checkSumModulo10(data);
  }

  return data;
}