git commit --amend --allow-empty
그때
git push origin master
자식은 말했다
! [rejected] master -> master (non-fast-forward)
error: failed to push some refs to 'remoteurl'
To prevent you from losing history, non-fast-forward updates were rejected
Merge the remote changes (e.g. 'git pull') before pushing again. See the
'Note about fast-forwards' section of 'git push --help' for details.
왜? 이 문제를 해결하는 방법?