feat(#17): clippy reject unwrap puzzle

server/src/objects/user.rs

@@ -41,6 +41,9 @@ impl User {
 //  apply it to the storage. Keep in mind that application function in the
 //  storage should be thread-safe (as well as #xml function). Don't forget to
 //  create unit tests that prove that.
+// @todo #17:30min Configure clippy to reject code with #unwrap().
+//  We should prohibit to use #unwrap() function in our code. Let's configure
+//  clippy tool in the respective manner and get rid of all #unwrap() calls.
 impl User {
     pub async fn save(self) -> Result<()> {
         info!("registering user @{}", self.username);