* Update avl_tree.md
* Remove the empty space
* Simplify the heading of the paperbook chapter
* Update hash_map_open_addressing.go to the latest version
* Improvements
* feat(go): support hash map chaining
* feat(go): support hash map open address
* feat(go): support simple hash
* feat(go): support top k heap
* feat(go): support subset sum I
* feat(go): support subset sum native
* feat(go): support subset sum II
* fix(go): fix some problem