AndroidStudy https://www.raywenderlich.com/3595916-clean-architecture-tutorial-for-android-getting-started#toc-anchor-025 https://medium.com/android-dev-hacks/detailed-guide-on-android-clean-architecture-9eab262a9011 https://proandroiddev.com/why-you-need-use-cases-interactors-142e8a6fe576