Separated the code

src/models/common.rs

@@ -0,0 +1,11 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Deserialize)]
+pub struct CreateUser {
+    pub username: String,
+}
+
+#[derive(Serialize)]
+pub struct User {
+    pub username: String,
+}

src/models/mod.rs

@@ -0,0 +1 @@
+pub mod common;