Connect nodes at same level in binary tree

link to question:
https://practice.geeksforgeeks.org/problems/connect-nodes-at-same-level/1
i’ve used BFS using queue to solve it.
i am not able to find where my code is wrong.Below is link to my code.You need to check only connect method in my code.
https://practice.geeksforgeeks.org/viewSol.php?subId=e72bc9c7e14cff430ca3787cf384fab7&pid=700184&user=mrakesh4444

Give the question link not solution link.

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i updated the blog.Please check