A professor is taking two courses in this semester. Some students are enrolled in one of his courses while some are enrolled in both. To maintain the data of his students, he creates a program using linked lists. He maintains a list for each course containing the names of the students enrolled in that course. Now he wants to check which students are attending both of his courses. Considering the given ADTs, use only the attributes and member functions outlined to create a non-member C++ function Node* common(Node *head1, Node *head2) that takes the two lists (i.e. course1 and course2) as argument and returns a single list