In C++

Task C. Implementing Vigenere cipher encryption Write a program vigenere.cpp . It should contain a function encryptVigenere implementing this cipher: string encryptvigenere(string plaintext, string keyword); You may assume that the keyword contains only lowercase alphabetic characters a z. The main should implement a testing interface similar to the one in Task B, the user enters the plaintext and the keyword, and the program reports the ciphertext. Example s /vigenere Enter plaintext: Hello, World! Enter keyword: cake CiphertextJevpq, Wyvnd