Fix register

src/main/kotlin/routes/UserRoutes.kt

@@ -20,6 +20,7 @@ import org.http4k.routing.routes
 
 data class Message(val msg: String)
 data class Login(val username: String, val password: String)
+data class Register(val username: String, val password: String)
 
 class UserRoutes(
     private val userRepository: UserRepository,
@@ -30,6 +31,7 @@ class UserRoutes(
     private val userLens = Body.auto<User>("user", ContentNegotiation.StrictNoDirective).toLens()
     private val msgLens = Body.auto<Message>().toLens()
     private val loginLens = Body.auto<Login>().toLens()
+    private val registerLens = Body.auto<Register>().toLens()
     private val idLens = Path.long().map { UserId(it) }.of("id")
     private val userIdLens = RequestContextKey.required<UserId>(ctx, "auth")
 
@@ -37,7 +39,8 @@ class UserRoutes(
 
     override fun get() = routes(
         "/user" bind POST to {
-            userRepository.create(userLens(it))
+            val (username, password) = registerLens(it)
+            userRepository.create(User(null, username, password))
             Response.ok().with(msgLens of Message("created"))
         },
         "/user/{id}" bind GET to {