carpBasePath property
The base path for storing all CARP related files on the form
<localApplicationPath>/carp
Implementation
Future<String> get carpBasePath async {
  if (_carpBasePath == null) {
    _carpBasePath = '${await localApplicationPath}/carp';
    var directory = Directory(_carpBasePath!);
    await directory.exists().then((exists) {
      if (!exists) directory.createSync(recursive: true);
    });
  }
  return _carpBasePath!;
}