replaced with the parent class in the main class and removed the empt…

…y lines

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

@@ -1,13 +1,11 @@
 package core.basesyntax;
-
 public class Bulldozer extends Machine {
     @Override
     public void doWork() {
         System.out.println("Bulldozer machine started its work");
     }
     @Override
     public void stopWork() {
-
         System.out.println("Bulldozer machine stopped its work");
     }
 }

src/main/java/core/basesyntax/Excavator.java

@@ -1,14 +1,11 @@
 package core.basesyntax;
-
 public class Excavator extends Machine {
     @Override
     public void doWork() {
-
         System.out.println("Excavator machine started its work");
     }
     @Override
     public void stopWork() {
-
         System.out.println("Excavator machine stopped its work");
     }
 }

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

@@ -1,7 +1,5 @@
 package core.basesyntax;
-
 public abstract class Machine {
     public abstract void doWork();
     public abstract void stopWork();
-
 }

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

@@ -1,10 +1,9 @@
 package core.basesyntax;
-
 public class MainApp {
     public static void main(String[] args) {
-        Truck truck = new Truck();
-        Bulldozer bulldozer = new Bulldozer();
-        Excavator excavator = new Excavator();
+        Machine truck = new Truck();
+        Machine bulldozer = new Bulldozer();
+        Machine excavator = new Excavator();
         Machine[] machines = new Machine[]{truck, bulldozer, excavator};
         for (Machine machine : machines) {
             machine.doWork();

src/main/java/core/basesyntax/Truck.java

@@ -1,14 +1,11 @@
 package core.basesyntax;
 public class Truck extends Machine {
-
     @Override
     public void doWork() {
-
         System.out.println("Truck machine started its work");
     }
     @Override
     public void stopWork() {
-
         System.out.println("Truck machine stopped its work");
     }
 }