* add permutations_ii.c and re-implement permutations_i.c * Update the implementation of hash_map_open_addressing.js and .ts * Update hash_map_open_addressing.js * Update hash_map_open_addressing.js
* refactor(chapter_hashing): Remove unnecessary chaining operator * feat(chapter_hashing): Add js and ts codes for chapter 6 * refactor(chapter_hashing): Optimize the remove function logic * refactor(chapter_hashing): Remove unnecessary chaining operator * refactor(chapter_hashing): use const instead of let