Update HelloWorld.java

src/main/java/controller/HelloWorld.java

@@ -14,7 +14,7 @@ public class HelloWorld  extends HttpServlet {
 
     @Override
     public void init() throws ServletException {
-        message = "Hello world, this message is from servlet! Good Luck.";
+        message = "Hello world, this message is from servlet! Good Luck. ";
     }
 
     @Override