Separated the code

src/callers/register.rs

@@ -0,0 +1,12 @@
+use axum::{Json, http::StatusCode};
+
+use crate::models;
+
+pub async fn register_user(
+    Json(payload): Json<models::common::CreateUser>,
+) -> (StatusCode, Json<models::common::User>) {
+    let user = models::common::User {
+        username: payload.username.clone(),
+    };
+    (StatusCode::CREATED, Json(user))
+}