Create a class Book, with separate interface and implementation, comprised of the following attributes:

**You should have separate files for class definition and implementation: Book.h and Book.cpp

Data members (private):
string: title
string: author
Member functions (public):
Default constructor	Sets both title and author to empty strings
Parameterized constructor	Takes two strings for initializing title and author, in this order
getTitle()	Returns title as a string
setTitle(string)	(void) Assigns title the value of the input string
getAuthor()	Returns author as a string
setAuthor(string)	(void) Assigns author the value of the input string

It is advisable to write your own test cases for each class. Test your class in Cloud9 before submitting to the autograder, as the autograder has a submission limit of 20 tries.