Question: Modify helper function insert_in_order so that it will not insert a duplicate key. Use an output parameter to signal the success or failure of the

Modify helper function insert_in_order so that it will not insert a duplicate key. Use an output parameter to signal the success or failure of the insertion.

Write a function retrieve_node that returns a pointer to the node containing a specific key. The function should take a single ordered_list_t input parameter. If the desired node is not found, retrieve_node should return the NULL pointer.

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