private void AddRacket(GameObject obj)
{
//TODO: we should remove the previous racket from this.allObjects
// 03. Removing the old Racket using Lambda
// We can also search the whole list of objects and remove the object that is Racket
this.allObjects.RemoveAll(item => item is Racket);
this.staticObjects.RemoveAll(item => item is Racket);
this.playerRacket = obj as Racket;
this.AddStaticObject(obj);
}