Write a program to create circular link list (CLL1) by inserting following elements: 10, 20, 30, 40, 50, -60, -70, 60, 50, 40, 30, 20, and -10. Display the contents of CLL1. Later create a function to delete an element say 40 from CLL1. While deletion make sure that all entries of element 40 is deleted. Also, delete the nodes having negative value in its data part.