cargo fmt and cargo clippy

Author: Lslightly

homework/src/hello_server/cache.rs

@@ -72,7 +72,7 @@ impl<K: Eq + Hash + Clone, V: Clone> Cache<K, V> {
             }
             let new_value = f(key);
             *value = Some(new_value.clone());
-            return new_value;
+            new_value
         }
     }
 }

homework/src/hello_server/tcp.rs

@@ -41,7 +41,7 @@ impl CancellableTcpListener {
         self.is_canceled.store(true, Ordering::Release);
         let local_addr = self.inner.local_addr()?;
         let tcp_stream = TcpStream::connect(local_addr)?;
-        
+
         Ok(())
     }
 

homework/src/hello_server/thread_pool.rs

@@ -85,14 +85,10 @@ impl ThreadPool {
             let pool_inner = pool_inner.clone();
 
             let thread = thread::spawn(move || {
-                loop {
-                    if let Ok(job) = job_receiver.recv() {
-                        pool_inner.start_job();
-                        job.0();
-                        pool_inner.finish_job();
-                    } else {
-                        break;
-                    }
+                while let Ok(job) = job_receiver.recv() {
+                    pool_inner.start_job();
+                    job.0();
+                    pool_inner.finish_job();
                 }
             });
             _workers.push(Worker {