Android Kotlin Fundamentals codelab: 

**Name of the Codelab or Codelab URL**
https://codelabs.developers.google.com/codelabs/kotlin-android-training-coroutines-and-room#5

**Describe the problem**
`clear()` function isn't private, but should be.

**In which lesson and step of the codelab can this issue be found?**
Android Kotlin Fundamentals: 6.2 Coroutines and Room - Step 6

**codelab:** android-kotlin-fundamentals
