Simplify source code

[lampajr]

In my initial tool design I might have over-engineerized some portions of the code, this is going to increase the effort to maintain the project itself.

I am proposing to simplify the code

• for instance by reducing some sort of abstractions if not really needed
• there are many tests duplications, especially between cli and gha (even if once the args are parsed the logic is the same)
• ...

Any other idea is welcome :)