getRandString function
Implementation
String getRandString(int len) {
var r = Random();
const _chars =
'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890';
return List.generate(len, (index) => _chars[r.nextInt(_chars.length)]).join();
}