changes generation of random ID

src/de/hsmannheim/informatik/name/domain/RobotFactory.java

@@ -49,8 +49,7 @@ public class RobotFactory {
             case R2D2 -> {
                 int serialNumberR2D2;
                 do {
-                    String temp = String.format("%05d", r.nextInt(10000));
-                    serialNumberR2D2 = Integer.parseInt(temp);
+                    serialNumberR2D2 = r.nextInt(10000);
                     if (serialNumbersR2D2.size() == 10000) {
                         return null;
                     }