class Rover {
  int x;
  int y;
  String direction;

  Rover({required this.x, required this.y, required this.direction});

  void turnLeft() {
    const leftTurns = {
      'N': 'W',
      'W': 'S',
      'S': 'E',
      'E': 'N',
    };
    direction = leftTurns[direction]!;
  }
}