Creating Linked List Programs

[rishitc]

To create functions on linked lists, which:

1. Insert a node into a linked list based on the index value
2. Sort a linked list to make it ordered
3. Destroy a linked list
   1. Manage memory leaks and dangling pointers
4. Search for elements in a linked list
   1. Return the frequency of them as well
5. To create a slice of a linked list
   1. Add negative indexing support as well