One problem with the previous exercise is that it does not deal with the case when we drop off the end of the alphabet. A true Caesar cipher does the shifting in a circular fashion where the next character after z is a. Modify your solution to the previous problem to make it circular. You may assume that the input consists only of letters and spaces. Hint: make a string containing all the characters of your alphabet and use positions in this string as your code. You do not have to shift z into a just make sure that you use a circular shift over the entire sequence of characters in your alphabet string. A Caesar cipher is a simple substitution cipher based upon the idea of shifting each letter of the plaintext message a fixed number (called the key) of positions in the alphabet. A true Caesar cipher does the shifting in a circular fashion where the next character after z is a Write a program that can encode and decode Caesar ciphers. The input to the program will be a string of plaintext and the value of the key. The output will be encoded message where each character in the original message is replaced by shifting it key characters in the Unicode character set. Test your program by encoding the following message: the ships sail at midnight. Then decode the message that was encrypted. #decode as well as encode