toVoucherNumberString method

String toVoucherNumberString()

Implementation

String toVoucherNumberString() {
  final number = this;
  String str = '';
  for (int i = 0; i < number.length; i++) {
    if (i % 4 == 0) {
      str = '$str ';
    }
    str += number[i];
  }
  return str.trim();
}