Fix cargo clippy issue

src/main.rs

@@ -73,11 +73,13 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
             let mut req_file = OpenOptions::new()
                 .create(true)
+                .truncate(true)
                 .write(true)
                 .open(Path::new(&args.storage_path).join(format!("{base_file_name}-req")))
                 .expect("Failed to create req file");
             let mut res_file = OpenOptions::new()
                 .create(true)
+                .truncate(true)
                 .write(true)
                 .open(Path::new(&args.storage_path).join(format!("{base_file_name}-res")))
                 .expect("Failed to create req file");