demo

src/main/kotlin/mvc/services/UserService.kt

@@ -1,7 +1,8 @@
 package mvc.services
 
 import mvc.entities.User
+import shared.dto.ChangeUsernameDto
 
 interface UserService {
-    fun changeUsername(user: User): User
+    fun changeUsername(userDto: ChangeUsernameDto): User
 }