diff --git a/app/build.gradle b/app/build.gradle
index 4cb6534..3730085 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -50,7 +50,6 @@ android {
 }
 
 dependencies {
-    implementation project(':data')
     implementation project(':domain')
     implementation project(':usecase')
 
diff --git a/data/src/main/java/com/lj/data/di/Singleton.kt b/data/src/main/java/com/lj/data/di/Singleton.kt
index d8f5d73..ea71932 100644
--- a/data/src/main/java/com/lj/data/di/Singleton.kt
+++ b/data/src/main/java/com/lj/data/di/Singleton.kt
@@ -4,19 +4,25 @@ import com.lj.data.repository.MessageRepositoryImpl
 import com.lj.domain.repository.MessageRepository
 import dagger.Binds
 import dagger.Module
+import dagger.Provides
 import dagger.hilt.InstallIn
 import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
 
 /**
  * Module to inject/provide repositories.
  */
 @InstallIn(SingletonComponent::class)
 @Module
-abstract class Singleton {
+
+class Singleton {
 
     /**
      * Provide the implementation of [MessageRepository].
      */
-    @Binds
-    abstract fun provideMessageRepository(repository: MessageRepositoryImpl): MessageRepository
+    @Provides
+    @Singleton
+    fun provideMessageRepository(): MessageRepository{
+        return MessageRepositoryImpl()
+    }
 }
diff --git a/data/src/main/java/com/lj/data/repository/MessageRepositoryImpl.kt b/data/src/main/java/com/lj/data/repository/MessageRepositoryImpl.kt
index 960a384..0515ad5 100644
--- a/data/src/main/java/com/lj/data/repository/MessageRepositoryImpl.kt
+++ b/data/src/main/java/com/lj/data/repository/MessageRepositoryImpl.kt
@@ -7,7 +7,7 @@ import javax.inject.Inject
 /**
  * [MessageRepository] implementation.
  */
-class MessageRepositoryImpl  @Inject constructor() : MessageRepository {
+internal class MessageRepositoryImpl : MessageRepository {
 
     /**
      * Get a message with a [prefix] and a [name].
diff --git a/usecase/build.gradle b/usecase/build.gradle
index 7886805..7604852 100644
--- a/usecase/build.gradle
+++ b/usecase/build.gradle
@@ -34,6 +34,7 @@ android {
 
 dependencies {
     implementation project(':domain')
+    implementation project(':data')
 
     implementation "androidx.core:core-ktx:$core_ktx_version"
 
diff --git a/usecase/src/main/java/com/lj/usecase/di/Singleton.kt b/usecase/src/main/java/com/lj/usecase/di/Singleton.kt
index 9601bd2..a0c6b18 100644
--- a/usecase/src/main/java/com/lj/usecase/di/Singleton.kt
+++ b/usecase/src/main/java/com/lj/usecase/di/Singleton.kt
@@ -1,9 +1,11 @@
 package com.lj.usecase.di
 
+import com.lj.domain.repository.MessageRepository
 import com.lj.domain.usecase.HelloUseCase
 import com.lj.usecase.implementation.HelloUseCaseImpl
 import dagger.Binds
 import dagger.Module
+import dagger.Provides
 import dagger.hilt.InstallIn
 import dagger.hilt.components.SingletonComponent
 
@@ -12,11 +14,13 @@ import dagger.hilt.components.SingletonComponent
  */
 @InstallIn(SingletonComponent::class)
 @Module
-abstract class Singleton {
+class Singleton {
 
     /**
      * Provide an implementation for [HelloUseCase].
      */
-    @Binds
-    abstract fun provideHelloUseCase(useCase: HelloUseCaseImpl): HelloUseCase
+    @Provides
+     fun provideHelloUseCase( repository: MessageRepository): HelloUseCase {
+      return  HelloUseCaseImpl(repository)
+    }
 }
diff --git a/usecase/src/main/java/com/lj/usecase/implementation/HelloUseCaseImpl.kt b/usecase/src/main/java/com/lj/usecase/implementation/HelloUseCaseImpl.kt
index 1b9b863..a611074 100644
--- a/usecase/src/main/java/com/lj/usecase/implementation/HelloUseCaseImpl.kt
+++ b/usecase/src/main/java/com/lj/usecase/implementation/HelloUseCaseImpl.kt
@@ -8,7 +8,9 @@ import javax.inject.Inject
  * [HelloUseCase] implementation:
  * Get a 'Hello message from a [String] using [MessageRepository].
  */
-class HelloUseCaseImpl @Inject constructor(private val repository: MessageRepository) : HelloUseCase {
-    override fun invoke(input: String): String =
-        repository.getMessage("Hello", input).format()
+internal class HelloUseCaseImpl (private val repository: MessageRepository) : HelloUseCase {
+    override fun invoke(input: String): String{
+        return repository.getMessage("Hello", input).format()
+    }
+
 }