generate method
Implementation
@override
String generate(int length) {
final random = Random.secure();
final allowedCodeUnits = RandomStringGenerator.allowedCharacters.codeUnits;
final max = allowedCodeUnits.length;
final randomString = <int>[];
for (var i = 0; i < length; ++i) {
randomString.add(allowedCodeUnits.elementAt(random.nextInt(max)));
}
return String.fromCharCodes(randomString);
}