Find next node of same level of given key in binary tree

Given a binary tree and a key value, we need to find the next node of the same level as the given key. The next node of the same level means the node that is present at the same depth and at the same position as the given key. In other words, we need to find the node that is the immediate right sibling of the node that contains the given key.

Here given code implementation process.

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