Pig Latin

pig_latin.rb

def translate(string)
    vowel = ["a", "e", "i", "o", "u", "y"]

    if ((vowel.include? string[0]) == false) && ((vowel.include? string[1]) == false) && ((vowel.include? string[2]) == false)
        string = string[3..-1] + string[0..2] + "ay"
    elsif ((vowel.include? string[0]) == false) && ((vowel.include? string[1]) == false)
        string = string[2..-1] + string[0..1] + "ay"
    elsif (vowel.include? string[0]) == true
        string = string + "ay"
    elsif string[0..1] == "qu"
        string = string[2..-1] + string[0..1] + "ay"
    else
        string = string[1..-1].+string[0].+"ay"
    end

    puts string
end