Write a program that provides the user with three options:

(1) Copy files

(2) Compare files

(3) Stop

For option (1), the program should prompt the user for the names of two text files. Then, the content of the first file will be copied to the second file.

For option (2), the program should prompt the user for the names of two text files to find out if the contents of the two files are identical. After the comparison, it should indicate whether the two files are identical. If they are not identical, the program should display the first lines from each program that differ from each other.

The program should terminate only when option (3) is chosen.