func numberOfVowels(in string: String) -> Int {
	var count = 0
	for char in string.lowercased() {
		switch char {
		case "a", "e", "i", "o", "u":
			count += 1
		default:
			()
		}
	}
	return count
}


numberOfVowels(in: "The quick brown fox jumps over the lazy dog")