Corrects README.md

null-object/README.md

@@ -141,11 +141,16 @@ public final class NullNode implements Node {
 Then we can construct and traverse the binary tree without errors as follows.
 
 ```java
-    Node root =
-        new NodeImpl("1", new NodeImpl("11", new NodeImpl("111", NullNode.getInstance(),
-            NullNode.getInstance()), NullNode.getInstance()), new NodeImpl("12",
-            NullNode.getInstance(), new NodeImpl("122", NullNode.getInstance(),
-            NullNode.getInstance())));
+    var root = new NodeImpl("1",
+            new NodeImpl("11",
+                new NodeImpl("111", NullNode.getInstance(), NullNode.getInstance()),
+                NullNode.getInstance()
+            ),
+            new NodeImpl("12",
+                NullNode.getInstance(),
+                new NodeImpl("122", NullNode.getInstance(), NullNode.getInstance())
+            )
+        );
     root.walk();
     
     // 1

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

@@ -37,7 +37,7 @@ public class App {
    * @param args command line args
    */
   public static void main(String[] args) {
-    Node root = new NodeImpl("1",
+    var root = new NodeImpl("1",
         new NodeImpl("11",
             new NodeImpl("111", NullNode.getInstance(), NullNode.getInstance()),
             NullNode.getInstance()