Is there a convenient way to work with git for two projects with several of the same classes?

Question

git

There are two projects that have a common core (3-4 classes) around which a dozen different classes are written.
I would like to be able to easily commit different edits to two projects in parallel, but at the same time, if there is a change in common files, the second project could get them with one or two git commands.
Can you please tell me the easiest way to implement this?

Answer 1

git submodule

Answer 2

I would suggest breaking it all into 3 repositories - one "core" and two - project. The kernel is "assembled" and included in the form of ready-made code by some dependency manager that is used in your language. Composer - php, pip - python. For the main repository, you will have to create a setup and all the binding to install it as a regular plug-in package (library) in your code.