by 夏泽民 Jul 16, 2020
https://colobu.com/2020/07/15/implement-bst-in-Go/ https://mp.weixin.qq.com/s/_jFpB7kQgIkEZKHvSYH8ug http://bencane.com/stories/2020/07/06/how-i-structure-go-packages/
