Merge two sorted linked list

#1

sir, why you return c at the end of the function.
is it necessary?

#2

In this question we are merging two sorted linkedlists into a new linkedlist. ‘a’ is the head of one linkedlist and ‘b’ is the head of another linkedlist. And we are merging these 2 linkedlists into a new linkedlist who head is ‘c’. So, it is absolutely necessary to return ‘c’, else we wont be having the pointer to the head of the newly created linkedlist.

#3

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#4

https://ide.codingblocks.com/s/409936…
this is my code for merging sorted linked list.Up on submission I am facing RUN ERROR.But when giving custom input the output is as expected.can someone please help?