Define a function make_pig_latin that consumes a word (a string) and converts it to actual pig latin (also a string). If the first letter of the word is a vowel, just return that word with "ay" added to the end. Otherwise, take the first character of the word and move it to the end of the string, and then add "ay" to the end. Do not worry about capitalization. If the empty string is given, return "ay".