res/navigation/nav_view.xml
        <?xml version="1.0" encoding="utf-8"?>
        <navigation xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            xmlns:tools="http://schemas.android.com/tools"
            app:startDestination="@+id/navigation_home">
        
            <fragment
                android:id="@+id/navigation_home"
                android:name="com.example.bottomnavigationkotlin.fragments.HomeFragment"
                tools:layout="@layout/fragment_home" />
        
            <fragment
                android:id="@+id/navigation_chat"
                android:name="com.example.bottomnavigationkotlin.fragments.ChatFragment"
                tools:layout="@layout/fragment_chat" />
        
            <fragment
                android:id="@+id/navigation_profile"
                android:name="com.example.bottomnavigationkotlin.fragments.ProfileFragment"
                tools:layout="@layout/fragment_profile" />
        </navigation>