creating mirror of a tree

MirrorOfTree.psudocode

Given a Binary Tree, convert it into its mirror.

    1                            1 
  /   \                         / \
 3     2       ====> .         2 . 3
      / \                     / \
     5   4                   4   5
     

traverse(node){
  if(node == null){
    return;
  }
  traverse(node -> left);
  traverse(node -> right);
  if(node->left!=null && node->right!=null){
    nodeLeft = node->left;
    node->left = node->right;
    node->right = nodeLeft;
  }
}