The code does not work.

class Point {
    var x: Int
    var y: Int

    init(x: Int, y: Int){
        self.x = x
        self.y = y
    }
}

class Machine {
    var location: Point

    init() {
        self.location = Point(x: 0, y: 0)
    }

    func move(direction: String) {
        print("Do nothing! Im a machine!")
    }
}

class Robot: Machine {

  init(x: Int, y: Int) {
    super.init(x:x, y:y)
  }
  override func move(direction: String) {
    if direction == "Up" {
      y += 1
    }

    if direction == "Down" {
      y -= 1
    }

    if direction == "Left" {
      x += 1
    }

    if direction == "Right" {
      x -= 1
    }
  }
}