Git operations should not produce duplicates in local .gitconfig file

Current Situation
Currently, to provide a number of users the possibility to use a locally cloned Git repository in a shared way, the local .gitconfig file will be updated with each executed git command from JOC. Unfortunately the used git command produces new entries each time it is called.

Desired Behavior

When git commands are executed from JOC the entries of the local .gitconfig file should be updated and should not contain any duplicates.