Resolves checkstyle errors for naked-objects null-object object-mother object-pool observer queue-load-leveling (#1082)

* Reduces checkstyle errors in naked-objects

* Reduces checkstyle errors in null-object

* Reduces checkstyle errors in object-mother

* Reduces checkstyle errors in object-pool

* Reduces checkstyle errors in observer

* Reduces checkstyle errors in queue-load-leveling

null-object/src/main/java/com/iluwatar/nullobject/NullNode.java

@@ -24,17 +24,16 @@
 package com.iluwatar.nullobject;
 
 /**
- * 
  * Null Object implementation for binary tree node.
- * <p>
- * Implemented as Singleton, since all the NullNodes are the same.
  *
+ * <p>Implemented as Singleton, since all the NullNodes are the same.
  */
 public final class NullNode implements Node {
 
   private static NullNode instance = new NullNode();
 
-  private NullNode() {}
+  private NullNode() {
+  }
 
   public static NullNode getInstance() {
     return instance;