a$)(10$ points$)$ Implement the HeadTailList $($double value$)$ constructor.

b$)(10$ points$)$ Implement a method insertFront $($double value$)$ to add a new element at

the front of the list.

c$)(10$ points$)$ Implement a method insertEnd $($double value$)$ to add a new element at the

end of the list.

d$)(20$ points$)$ Implement a method insertAtPosition$($double value, int position$)$ to

insert a new element at a specified position in the list.

e$)(10$ points$)$ Implement a method removeEnd $()$ to delete the last element of the list.

f$)(10$ points$)$ Implement a method printList $()$ to display all items in the list.