Answer Posted / prakashdasari

node *ptr1,*ptr2,*ptr3;
ptr1=start;
ptr2=ptr1->next;
ptr3=ptr2->next;
ptr1->next=NULL;
ptr2->next=ptr1;
while(ptr3!=NULL)
{
ptr1=ptr2;
ptr2=ptr3;
ptr3=ptr3->next;
ptr2->next=ptr1;
}
start = ptr2;

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