https://mire-salt-f24.notion.site/1-241220-Chapter1-Refactoring-A-First-Example-16f27fdb9a6180578e2bc056c042ee83?pvs=4
https://mire-salt-f24.notion.site/2-241227-Chapter1-Refactoring-A-First-Example-16f27fdb9a618052a687da8b3499a2bc?pvs=4