Some Online Infos
https://qiita.com/xantojoe
https://note.com/xanto/n/nf14e11205b93
https://www.cnblogs.com/xdzhcs/p/17803447.html
https://xanto.substack.com/p/practical-methods-for-counting-characters
https://xanto.gorillawiki.jp/entry/c8edbbac8be552bc0f53f