Modify sonarqube analysis

src/main/java/com/rest/api/controller/HelloController.java

@@ -9,6 +9,8 @@ import org.springframework.web.bind.annotation.ResponseBody;
 @Controller
 public class HelloController {
 
+    private static final String HELLO = "helloworld";
+
     @Setter
     @Getter
     public static class Hello {
@@ -18,19 +20,19 @@ public class HelloController {
     @GetMapping(value = "/helloworld/string")
     @ResponseBody
     public String helloworldString() {
-        return "helloworld";
+        return HELLO;
     }
 
     @GetMapping(value = "/helloworld/json")
     @ResponseBody
     public Hello helloworldJson() {
         Hello hello = new Hello();
-        hello.message = "helloworld";
+        hello.message = HELLO;
         return hello;
     }
 
     @GetMapping(value = "/helloworld/page")
     public String helloworld() {
-        return "helloworld";
+        return HELLO;
     }
 }