Method List
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#add_at_head DoublyLinkedList
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#add_at_index DoublyLinkedList
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#add_at_tail DoublyLinkedList
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#delete_at_index DoublyLinkedList
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#get DoublyLinkedList
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#head DoublyLinkedList
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#initialize DoublyLinkedList
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#initialize DoublyLinkedListNode
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#last DoublyLinkedList
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#length DoublyLinkedList
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#next DoublyLinkedListNode
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#prev DoublyLinkedListNode
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#to_s DoublyLinkedList
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#val DoublyLinkedListNode