Submission 2

Treewide: Apply dicoding advice on submission 2

* ApiConfig
  Only use logging interceptor while in debug build

* Adapter (Api or Local)
  Change variable to "_" when it's not use on adapter
  use declaration of "with(binding)" to avoid loop written of binding

* Repository
  Re-order companion object into bottom line of the code

* SplashScreen
  Re-declare constant value for timer on companion object

Also include cleanup code

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