refactor 449

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_449.java

@@ -116,7 +116,7 @@ private TreeNode deserialize(String[] values, int[] index, int minValue) {
 
     public static class Solution3 {
         /**
-         * This is a generic solution that applies to both BT and BST.
+         * This is a generic solution that applies to both BT and BST. And also the easiest to follow.
          */
 
         // Encodes a tree to a single string.