Now it's time to write a function that will encode a given String value using the caesar Cipher.
The function should only needs to work with lowercase letters from a - z and a space character. So your alphabet will be:
Hint: You can use the toLowerCase() method of the String type to transform your input string to lowercase characters.
The function needs to take 2 parameters. The first parameter should be of type String and hold the value of the phrase you want to encode. The second parameter should be of type Number and hold the value of the key.
Caesar Cipher Enciding Function
// Write your encode function here.
// Please note the function name must be: encode
module.exports = encode;
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