FInd a way to load less data from files

Loading data from files takes a lot of time (finding location, getting path right).

It would be good to reduce that.

One solution would be to reuse the same data in all exercises, so that it is loaded only once.

Another would be to provide some of it directly in template exercise files.

首先檢查練習範本和現有的檔案載入路徑，以確定資料位於何處以及在哪裡被重複載入。比較 issue 中提出的兩種方法，並與 maintainer 確認預期範圍。當練習需要重複定位檔案的工作減少，且共用資料的載入次數不超過必要程度時，即視為完成。

由索引模型根據 Issue 內容生成。