Suppose that we would like to perform a bird survey to count the number of birds of each species in an area. Create a class BirdSurvey that is like one of the linked-list classes given in this chapter. (The linked list you use will affect what your new class can do, so give some thought to your choice.) Modify the inner node class to add room for a count.

BirdSurvey should have the following operations:

• add(bird)—adds the bird species bird to the end of the list, if it is not already there, and sets its count to 1; otherwise, adds 1 to the count for bird.
• getCount(bird)—returns the count associated with the species bird. If bird is not on the list, returns zero.
• getReport—displays the name and count for each bird species on the list.

Write a program that uses BirdSurvey to record the data from a recent bird survey. Use a loop to read bird names until done is entered. Display a report when finished.