title: Copy binary tree in order
body: <p>The code I wrote so far is:</p>
  
  <pre><code>void copyInOrder(TNode *orgTree, Tnode *&amp; copyTree){
      if(orgTree !=NULL){
          copyInOrder(orgTree-&gt;left_link);
          //create leftmost node of tree but how to link to parent
          copyInOrder(orgTree-&gt;right_link);
      }
  }
  </code></pre>
  
  <p>I dont know how to link to the parent to the nodes as its inorder.</p>