test with kerkour architecture (https://kerkour.com/rust-web-application-clean-architecture)

src/domain/rolle/service.rs

@@ -0,0 +1,17 @@
+mod create_user;
+
+use super::repository::Repository;
+use crate::database::DB;
+
+#[derive(Debug)]
+pub struct Service {
+    repo: Repository,
+    pub db: DB,
+}
+
+impl Service {
+    pub fn new(db: DB) -> Self {
+        let repo = Repository::new();
+        Self { repo, db }
+    }
+}