func checkForVowels(in word: String) -> Int {

    var vowels: [String] = []

    for letter in word {
        if letter == "a" {
            vowels.append(String(letter))
        } else if letter == "A"{
            vowels.append(String(letter))
        } else if letter == "e" {
            vowels.append(String(letter))
        } else if  letter == "E" {
            vowels.append(String(letter))
        } else if letter == "o" {
            vowels.append(String(letter))
        } else if letter == "O" {
            vowels.append(String(letter))
        }else if letter == "u"{
            vowels.append(String(letter))
        } else if letter == "U" {
            vowels.append(String(letter))

        }

    }
    return vowels.count
}