Various linked lists functioanlity

Linked list implemented above perform below operations:

1. InsertAtBeginning() : Insert an element at the start of list.
2. InsertMiddleBefore(): Insert an element at the middle of list before the data by user.
3. InsertMiddleAfter(): Insert an element at the middle of list after the data by user.
4. InsertAtEnd(): Insert an element at the end of list.
5. DeleteBeginning() : Delete an element from the beginning of list.
6. DeleteMiddleAfter(): Delete an element from the middle of list after the data by user.
7. DeleteMiddleBefore() : Delete an element from the middle of list before the data by user.
8. DeleteEnd() : Delete the element from the end.
9. FindMiddle(): Find the middle element of the lists. 10)SortLists(): Sort the given lists. 11)Reverse() : Reverses the list. 12)PrintReverse() : Print the data of list in reverse order.