git rm -r frontend
git commit -m "remove old frontend module"
git subtree add --prefix=frontend <FE repo> main --squash
https://github.com/Yut-nori/Yutnori_FE.git
https://github.com/Yut-nori/Yutnori_FE_FX.git
git fetch frontend
git subtree add --prefix=frontend frontend <branch name> --squash
git fetch backend
git subtree add --prefix=backend backend <branch name> --squash
gradlew.bat :frontend:shadowJar