public exerciseIntro2Mover(movingObject movingObj)
    {
        findWindowLimits();
        location = Vector2.zero;
        movingOb = movingObj;
        //We need to create a new material for WebGL
        Renderer r = mover.GetComponent <Renderer>();

        r.material = new Material(Shader.Find("Diffuse"));
    }
 // Start is called before the first frame update
 void Start()
 {
     moveObj = new movingObject();
     walker  = new exerciseIntro2Mover(moveObj);
 }