fix checkstyle findings

src/main/java/de/thpeetz/generations/App.java

@@ -5,7 +5,8 @@ import org.slf4j.LoggerFactory;
 
 /**
  * Example App class.
- * @author tpeetz
+ * 
+ * @author Thomas Peetz
  *
  */
 public class App {
@@ -17,6 +18,7 @@ public class App {
 
     /**
      * Returns greeting.
+     * 
      * @return greeting
      */
     public String getGreeting() {
@@ -25,6 +27,7 @@ public class App {
 
     /**
      * Main entry point for application Generations.
+     * 
      * @param args Arguments
      */
     public static void main(final String[] args) {

src/test/java/de/thpeetz/generations/AppTest.java

@@ -1,6 +1,3 @@
-/*
- * This Java source file was generated by the Gradle 'init' task.
- */
 package de.thpeetz.generations;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;