Update code using single-class-single-functionality principle (using Service classes)

[Rocker2102]

Move business logic from controllers to service class (normally present in App\Services namespace).
This will help in reducing duplicated code.

References:
https://dev.to/fhsinchy/laravel-service-classes-explained-3m7p
https://medium.com/@remi_collin/keeping-your-laravel-applications-dry-with-single-action-classes-6a950ec54d1d