535-encode-and-decode-tinyurl

/**
 * Encodes a URL to a shortened URL.
 *
 * @param {string} longUrl
 * @return {string}
 */
var encode = function(longUrl) {
    return btoa(longUrl)
};

/**
 * Decodes a shortened URL to its original URL.
 *
 * @param {string} shortUrl
 * @return {string}
 */
var decode = function(shortUrl) {
    return atob(shortUrl);
};

/**
 * Your functions will be called as such:
 * decode(encode(url));
 */