Write a program in C++ to encrypt and decrypt strings of characters using Vigenere cipher

Your program should contain functions/methods to encrypt a given plaintext string of characters

and a key and generate the corresponding ciphertext. It should also contain functions/methods to

decrypt a ciphertext string of characters and generate the corresponding plaintext.

Please attach the

1-source code

2- txt files like

3- sample runs of the program.

decrypt,txt encrypt,txt a key tot plain. tot