Add better workflow in the code to make it faster and more readable

[Stronkness]

Currently the code feels a bit, bland and dirty. I want the code to be more readable and possibly faster to run (even though it doesn't take that much time)

For readability think that beginner coders or non-coders should understand the code

[Stronkness]

If you complete one of these two topics then im glad to accept it

[Stronkness]

Documentation: explain what the if stataments in the filtering function does