en a pointer to the head of a linked list, insert a new node before the head. The next value in the new node should point to head and the data value should be replaced with a given value. Return a reference to the new head of the list. The head pointer given may be null meaning that the initial list is empty. Function Description Complete the function insertNodeAtHead in the editor below. insertNodeAtHead has the following parameter(s): • SinglyLinkedListNode llist: a reference to the head of a list • data: the value to insert in the data field of the new node

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