if(_head==null)
      return null;

        if((p.equals(_head.getPoint())) && (getlength()==1)){//checks if the givvem point is the only point if does return a copy of the point.
            return _head.getPoint();
        }

        PointNode t = _head;
        while(t.getNext()!= null){
            t=t.getNext();
            if(t.getNext() == null){
                if(p.equals(t.getPoint()))
                    return new Point (_head.getPoint());
            }
            if (p.equals(t.getPoint()))
                return new Point (t.getNext().getPoint());
        }
        return null;