php - How to separate subprojects in a project in git into independent projects

Question

A project A in the git warehouse contains three sub-projects. How to separate one of the sub-projects into a separate project

Answer 1

Shouldn’t we copy it and then clone it into the previous project again

Answer 2

1. You can create a new branch
2. You can create a new warehouse

Since it is an independent project, you should create a new warehouse.

Answer 3

git submodule
git subtree
Probably refers to this? The words are unclear

Answer 4

git submodule