belasan method
Implementation
String belasan(String value1,
{required String number, required int len, required int currIndex}) {
String result = "";
if (number[currIndex + 1].isSatu) {
result += "Sebelas";
} else {
result += "${_satuan(number[currIndex + 1])} Belas";
}
// result += _addWhitespace(currIndex + 1, len, number);
return result;
}