getRandomString function
Returns a random string
Implementation
String getRandomString({int len = 16, String? prefix}) {
const charset = 'abcdefghijklmnopqrstuvwxyz0123456789';
var t = '';
for (var i = 0; i < len; i++) {
t += charset[(Random().nextInt(charset.length))];
}
if (prefix != null && prefix.isNotEmpty) t = prefix + t;
return t;
}