Convert App from Java to KMM

as we are now working on a new project to convert an existing Java + XML app into a Kotlin Multiplatform Mobile (KMM) app. We have already created a fresh KMM project for this purpose. Your task is to understand the functionality of the previous Java project and replicate it exactly in the KMM project. We will provide you with the Java code.

The Java project consists of the following components:
- 1 Activity
- 4 Fragments
- Firebase integration to fetch data from the Firebase Realtime Database and display it on the screen.

You can access the Java app on the following link: https://play.google.com/store/apps/details?id=com.msbte.modelanswerpaper


The task at hand is to ensure that the functionality of the app remains the same after converting it into a Kotlin Multiplatform Mobile (KMM) app. The ultimate goal is to make the app deployment-ready so that it can be uploaded to the Play Store.