1．Open Git Bash.
2．Create a bare clone of the repository.
$ git clone --bare https://github.com/exampleuser/old-repository.git
3．Mirror-push to the new repository.
$ cd old-repository.git
$ git push --mirror https://github.com/exampleuser/new-repository.git
4．Remove the temporary local repository you created in step 1.
$ cd ..
$ rm -rf old-repository.git
Reference and Credit: https://help.github.com/en/articles/duplicating-a-repository
