Fix build warnings (#3)

Reviewed-on: #3
Co-authored-by: phoenix <kundeng94@gmail.com>
Co-committed-by: phoenix <kundeng94@gmail.com>

src/main.rs

@@ -1,9 +1,11 @@
 use axum::{
-    Json, Router,
-    http::StatusCode,
-    routing::{get, post},
+    // Json,
+    Router,
+    // http::StatusCode,
+    routing::get,
+    // routing::{get, post},
 };
-use serde::{Deserialize, Serialize};
+// use serde::{Deserialize, Serialize};
 
 #[tokio::main]
 async fn main() {