Reformat and clean up "client" package

src/main/java/client/Client.java

@@ -153,7 +153,7 @@ public class Client extends ChannelInboundHandlerAdapter {
     }
 
     public static Client createMock() {
-        return new Client(null, -1,null, null, -123, -123);
+        return new Client(null, -1, null, null, -123, -123);
     }
 
     @Override