[MenuItem ("MyMenu/Do Test")]
    static void Test () 
    {
        Transform parent =  Selection.activeGameObject.transform;
        Vector3 postion = parent.position;
        Quaternion rotation = parent.rotation;
        Vector3 scale = parent.localScale;
        parent.position = Vector3.zero;
        parent.rotation = Quaternion.Euler(Vector3.zero);
        parent.localScale = Vector3.one;
        Vector3 center = Vector3.zero;
        Renderer[] renders = parent.GetComponentsInChildren<Renderer>();
        foreach (Renderer child in renders){
            center += child.bounds.center;   
        }
        center = parent.GetComponentsInChildren<Transform>().Length; 
        Bounds bounds = new Bounds(center,Vector3.zero);
        foreach (Renderer child in renders){
            bounds.Encapsulate(child.bounds);   
        }
        parent.position = postion;
        parent.rotation = rotation;
        parent.localScale = scale;
        foreach(Transform t in parent){
            t.position = t.position -  bounds.center;
        }
        parent.transform.position = bounds.center + parent.position;
    }