如何删除git子模块残骸？

在将我的代码历史记录推送到git存储库时，我发现Objective-C项目作为子模块工作，这意味着如果我推送Objective-C项目，它将像这样子模块工作。

注意到该因素后，我尝试重新初始化.git文件夹。（删除并尝试调用“ git init”）

但是它根本无法工作，并且子模块仍然有效。

我也尝试了git submodule deinit和init命令。但是，此后，即使我尝试将文件推送到git存储库，它也会抛出此消息。

Sogos-Macbook:Test code dkswogus7530$ git push -u origin master

To https://github.com/JaehyunAhn/cpuls2_book_review.git
! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'https://github.com/JaehyunAhn/cpuls2_book_review.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Merge the remote changes (e.g. 'git pull')
hint: before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

我还尝试更新并删除我的git存储库，以键入命令git pull origin master，并且该命令中止此消息

Compressing objects: 100% (4/4), done.
Writing objects: 100% (5/5), 537 bytes | 0 bytes/s, done.
Total 5 (delta 2), reused 0 (delta 0)
remote: error: object d5c202897cf6f769235a2707d15719636fe37984:contains duplicate file entries
remote: fatal: Error in object
error: unpack failed: index-pack abnormal exit
To https://github.com/JaehyunAhn/cpuls2_book_review.git
 ! [remote rejected] master -> master (unpacker error)
error: failed to push some refs to 'https://github.com/JaehyunAhn/cpuls2_book_review.git'

我该如何解决这个问题？

该子模块库从指着这个，这个和这个。