optimize imports, refformat code

src/main/java/hello/Application.java

@@ -1,15 +1,12 @@
 package hello;
 
-import java.util.List;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
-import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.ComponentScan;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+
+import java.util.List;
 
 @ComponentScan
 @EnableAutoConfiguration
@@ -21,8 +18,9 @@ public class Application implements CommandLineRunner {
 
         SpringApplication.run(Application.class, args);
     }
-        @Override
-        public void run(String... args) throws Exception {
+
+    @Override
+    public void run(String... args) throws Exception {
         // save a couple of customers
         repository.save(new Customer("aJack", "Bauer"));
         repository.save(new Customer("aChloe", "O'Brian"));