How to delete a node from the beginning a linked list data structure.
This function deletes the head node (i.e., the node at the beginning) of the linked list and returns its data. It first checks if the list is empty. If it is, it prints an error message and returns -1. If the list is not empty, it stores the data of the head node, updates the head of the list to be the next node, decreases the length of the list by one, and returns the stored data. If the list becomes empty after the deletion, it also updates the tail to null.
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