@Override
    public Shape getShape(String shapeType){
        if(shapeType==null){
            return null;
        }
        if (shapeType.equalsIgnoreCase("CIRCLE")){
            return new Circle();
        }
        else if (shapeType.equalsIgnoreCase("RECTANGLE")){
            return new Rectangle();
        }
        else if (shapeType.equalsIgnoreCase("SQUARE")){
            return new Square();
        }
        return null;
    }