Data structure questions
3- Write statements to change a doubly linked list to a doublycircular linked list without sentinels.
4- Write a method in doubly linked list to skip all nodescontaining even numbers. You should use the same class of doublylinked as in the book.
5- Use an array for linked lists of friends of each student inthe section. Without implementing it in Java, write all neededmethods to Add a friend to a student, remove a friend or print allfriends of a given student, or find shared friends of two givenstudents. All methods should be implemented and well tested in Javaexcept for last
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