refactored the project using the clap crate

src/main.rs

@@ -3,12 +3,9 @@ mod app;
 #[cfg(test)] 
 mod test;
 
-use std::env;
-
 use app::App;
 
 fn main() {
     let app = App::new();
-    let args = env::args().collect();
-    app.start(args);
+    app.start();
 }