Converting multilevel DLL to DLL (doubly linked list)

I could not get it why are we making a dummy node and at the end why are we passing dummy->next as the start of linked list. Why cant we simply return the head as the head ??

@nidhigupta847 timestamp ??

what timestamp ???

@nidhigupta847 i mean which part in the video ( the time of that part)
(i saw the whole video if you are talking about that 0 node than its just used for making the whole linklist and at last we remove it to get the original linklist)

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