Define a structure type auto_t to represent an automobile. Include components for the make and model (strings), the odometer reading, the manufacture and purchase dates (use another user-defined type called date_t), and the gas tank (use a user-defined type tank_t with components for tank capacity and current fuel level, giving both in galloons. Write I/O functions scan_date, scan_tank, scan_auto, print_date, print_tank, and print_auto, and also write a driver function that repeatedly fills and displays an auto structure variable until EOF is encountered in the input file.