Delete all Commit records on GitHub
git checkout --orphan latest_branch
git add -A
git commit -am "."
git branch -D master
git branch -m master
git remote set-url origin https://github.com/user/xxx.git
git push -f origin master
git checkout --orphan latest_branch
git add -A
git commit -am "."
git branch -D master
git branch -m master
git remote set-url origin https://github.com/user/xxx.git
git push -f origin master