Solution for Merge Two Binary Trees

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    public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
            //unnecessary to consider t1 and t2 are both null, because it will return t2, which is null;
            if (t1 == null) return t2;
            if (t2 == null) return t1;
            TreeNode root = new TreeNode(t1.val + t2.val);
            TreeNode left = mergeTrees(t1.left, t2.left);
            TreeNode right = mergeTrees(t1.right, t2.right);
            root.left = left;
            root.right = right;
            return root;

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