In the Function stated here, he took the C Pointer to not equal to NULL Right? Isnt C->next = NULL The SAME???
Why Can't C->next!= NULL Work?
@JaveedYara yes at first step c->next can be null as p=NULL. but when c moves forward you cant
do c->next as null as we have to reverse the link list so c->next should point to prev
see this animation (scroll down) https://www.geeksforgeeks.org/reverse-a-linked-list/ (curr is c)
dont forget to hit like and mark resolved if cleared 
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