Complete programming project 5 in Chapter 5 of the Hanly/Koffman Problem Solving & Program Design in C book. All input should be read from a file and output should be written to a file. Make sure that you design a function greatest_common_divisor() which calculates and returns the greatest common divisor of two integer numbers. Also, develop functions to read data from a file and to write data to a file.

Create a class named formletterwriter that includes two overloaded methods named the first method takes one string parameter that represents a customer’s last name, and it displays the salutation dear mr. or ms. followed by the last name. the second method accepts two string parameters that represent a first and last name, and it displays the greeting dear followed by the first name, a space, and the last name. after each salutation, display the rest of a short business letter: you for your recent order.