See: Refactoring: Improving the Design of Existing Code (2nd Edition) (Addison-Wesley Signature Series (Fowler)) 2nd Edition
- https://learning.oreilly.com/library/view/refactoring-improving-the/9780134757681
- https://smile.amazon.com/Refactoring-Improving-Existing-Addison-Wesley-Signature-ebook-dp-B07LCM8RG2/dp/B07LCM8RG2