C :: Finding Error In Delete Node Function

I have written a delete node function to delete a node in a linked list by the index number. Here is the code:

Code:

void delete_node(struct node **start,int index_no)
{ int counter=0;
struct node *current=*start, *prev=NULL;//Current holds start and prev holds previous node of current
while(current->next!=NULL)

[Code]....

note that I know if the head node turns out to be the indexed position, there is no way to delete that node in the current coding. But please after correcting the present node add that part of the code separately.