getUuid function
getRandom uuid for parameters @extra
Implementation
String getUuid(int length, {String? text}) {
var ch = '0123456789abcdefghijklmnopqrstuvwxyz';
if (text != null && text.isNotEmpty) {
ch = text;
}
Random r = Random();
return String.fromCharCodes(
Iterable.generate(length, (_) => ch.codeUnitAt(r.nextInt(ch.length))));
}