If necessary, create a new project named Introductory21 Project and save it in the Cpp8\Chap13 folder. Also create a new source file named Introductory21.cpp. Write a program that allows the user to enter three separate strings: a city name, a state name, and a ZIP code. The program should use string concatenation to display the city name followed by a comma, a space, the state name, two spaces, and the ZIP code. Use a sentinel value to end the program. Save and then run the program. Test the program.