Separated logic into utils file and fixed indexing bug

[ahmedehabb]

I separated the logic of getting a certain model by index into functions in a separate file called utils.py since i will use the same code in editing existing models. Also there is a bug in indexing (if 0 <= index < len(data["education"]) -1 ) this will exclude the last one which is incorrect. so i removed the -1

[ahmedehabb]

i still get linter error due to the functions in app.py not returning something outside of the if conditions. should I add return jsonify({}) as a last statement in each function.

[ahmedehabb]

when #25 get approved, I will pull the new changes and update this pr to solve linter issues.

[wrussell1999]

Hey @ahmedehabb! #25 is all merged in now, so you're good to now complete the following:

• [ ] Resolve merge conflicts in app.py.
• [ ] Run the linter and update the style of your code

[wrussell1999]

@ahmedehabb looks all good. Final thing to get it approved would be to update in the README what the purpose of the utils.py so future people know what to put in there!

[ahmedehabb]

sure, i'll do it now.