validateCheckDigitChecksum function
Implementation
void validateCheckDigitChecksum(String iban) {
if (calculateMod(iban) != 1) {
final String checkDigit = getCheckDigit(iban);
final String expectedCheckDigit = calculateCheckDigit(iban);
throw Exception(
"[$iban] has invalid check digit: $checkDigit, expected check digit is: $expectedCheckDigit");
}
}