My code keeps getting commented. I think there is a problem in the editor that keeps getting my code commented

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! I'm a machine!")
    }
}

// Enter your code below

class Robot: Machine{

    override func move(direction: String) {
        switch direction {
            case "Up": location.y = location.y++
            case "Down" : location.y = locationy--
            case "Right" : location.x = locationx++
            case "Left" : location.x = location.x--
            default: break

        }

    }