expect object AppDatabaseConstructor : RoomDatabaseConstructor

actual object AppDatabaseConstructor : RoomDatabaseConstructor {

override fun initialize(): AppDatabase{

How implemet this????
}
}

import androidx.room.ConstructedBy
import androidx.room.Dao
import androidx.room.Database
import androidx.room.Entity
import androidx.room.Insert
import androidx.room.PrimaryKey
import androidx.room.Query
import androidx.room.RoomDatabase
import androidx.room.RoomDatabaseConstructor
import kotlinx.coroutines.flow.Flow

const val DATABASE_NAME = "movie.db"

@Database(entities = [Movie::class], version = 1)
@ConstructedBy(AppDatabaseConstructor::class)
abstract class AppDatabase : RoomDatabase() {
    abstract fun getDao(): MovieDao
}

expect object AppDatabaseConstructor : RoomDatabaseConstructor<AppDatabase>

@Dao
interface MovieDao {
    @Insert
    suspend fun insert(item: Movie)

    @Query("SELECT count(*) FROM Movie")
    suspend fun count(): Int

    @Query("SELECT * FROM Movie")
    fun getAllAsFlow(): Flow<List<Movie>>
}

@Entity
data class Movie(
    @PrimaryKey(autoGenerate = true)
    val id: Int,
    val title: String,
    val overview: String,
    val releaseDate: String,
    val poster: String,
    val backdrop: String?,
    val originalTitle: String,
    val originalLanguage: String,
    val popularity: Double,
    val voteAverage: Double,
    val isFavorite: Boolean

)

I try all I can but nothing is working I am very lost Thank you