replaceCharacterWithCode function
Iban contain characters and should be converted to integer by 55 subtracted from there ascii value
@ignore
Implementation
String replaceCharacterWithCode(String str) {
// It is slower but a lot more readable
// https://jsbench.me/ttkzgsekae/1
return str.split('').map((String c) {
final int code = c.codeUnitAt(0);
return code >= 65 ? (code - 55).toString() : c;
}).join('');
}