Improve code with caches

### Link to the coursework

https://github.com/CodeYourFuture/Module-Complexity/tree/main/Sprint-2/improve_with_caches

### Why are we doing this?

Getting practical experience improving existing code to make it more efficient.

### Maximum time in hours

4

### How to submit

Fork the repo to your own GitHub account
Make regular small commits with clear messages
When you are ready, open a Pull Request to the CYF repo
Make sure you fill in the PR template provided

從連結的 repository 中 Sprint-2/improve_with_caches/ 裡的課程作業開始，閱讀現有程式碼以確定預期的效率改善。在該目錄中工作，保持 commit 小而清楚；當程式碼透過 caching 得到改善，並準備好使用所提供的範本建立 pull request 時，即表示完成。

由索引模型根據 Issue 內容生成。