fix code style; remove extra spaces

src/main/java/core/basesyntax/Bulldozer.java

@@ -1,7 +1,6 @@
 package core.basesyntax;
 
 public class Bulldozer extends Machine {
-
  @Override
  public void doWork() {
  System.out.println("Bulldozer started its work.");

src/main/java/core/basesyntax/Machine.java

@@ -1,9 +1,7 @@
 package core.basesyntax;
 
 public abstract class Machine {
-
  public abstract void doWork();
 
  public abstract void stopWork();
-
 }

src/main/java/core/basesyntax/MainApp.java

@@ -1,9 +1,7 @@
 package core.basesyntax;
 
 public class MainApp {
-
  public static void main(String[] args) {
-
  Machine truck = new Truck();
  Machine bulldozer = new Bulldozer();
  Machine excavator = new Excavator();