4. Question 4 Your colleagues often bring a few books to the office to read, then put them into shared book shelves, so other people have the chance to read it as well. After some days, the shelves have become messier and messier. As the office manager you are tasked to develop a function to sort them. As the basic information of a book, the name, author and edtion will be recorded. The function will recognize different books as following: