Updated typing system

Signed-off-by: TuDatTr <tuan-dat.tran@tudattr.dev>

tests/echo.rs

@@ -1,7 +1,7 @@
 use axum::http::{self, Request, StatusCode};
 use echo::{
     app,
-    messages::{BodyRequest, EchoRequest},
+    messages::{EchoRequest, Message, MessageBody},
 };
 use http_body_util::BodyExt;
 use serde_json::{json, Value};
@@ -11,18 +11,18 @@ use tracing::info;
 #[tokio::test]
 async fn specification() {
     tracing_subscriber::fmt::init();
-    let request = {
+    let request: Message = {
         let src = "c1".to_string();
         let dest = "n1".to_string();
-        let r#type = "echo".to_string();
+        let response_type = "echo".to_string();
         let msg_id = 1;
         let echo = "Please echo 35".to_string();
-        let body = BodyRequest {
-            r#type,
+        let body = MessageBody::EchoRequest(EchoRequest {
+            response_type,
             msg_id,
             echo,
-        };
-        EchoRequest { src, dest, body }
+        });
+        Message { src, dest, body }
     };
     let body = serde_json::to_string_pretty(&request).unwrap();
     info!("Request: {body}");