What code should be written in GIT to create a difference file (patch) of two other files?

Question

git

Installed GIT on windows.
1) The folder contains file "A" and file "B".
What commands need to be written in GIT in order to create a file "C" in the same folder, which will be the difference between file "A" and file "B".
2) The folder contains the file "A" and the patch file "C".
What commands need to be written in GIT in order to create a file "B" in the same folder, which will be the file "A" + patch "C"
In the Help for GIT, unfortunately I can not figure out what's what .. Please help ..

Answer 1

What you want to do has absolutely nothing to do with git.
Read about diff/patch