vowel counter

vowelCount.swift

/**
This will count and return the number of vowels in a string. Vowels are defined as "a, e, i, o, and u" and sometimes "y"! 
("y" is only counted when there's no other vowel in a word. A word is defined as a string of characters between spaces).
*/
func numberOfVowels(in string: String) -> Int {
	
	let vowels: Set<Character> = ["a", "e", "i", "o", "u"]
	let string = string.lowercased()
	let words = string.split(separator: " ")
	
	
	var totalCount = 0
	for word in words {
		var wordVowelCount = 0
		for letter in word {
			if vowels.contains(letter) {
				wordVowelCount += 1
			}
		}
		
		// and sometimes "y"!
		if wordVowelCount == 0 {
			for letter in word {
				if letter == "y" {
					wordVowelCount += 1
				}
			}
		}
		totalCount += wordVowelCount
	}
	
	return totalCount
}


print(numberOfVowels(in: "Hello World!")) // 3
print(numberOfVowels(in: "I have a lovely bunch of coconuts!")) // 11
print(numberOfVowels(in: "My")) // 1
print(numberOfVowels(in: "My goodness!")) // 4
print(numberOfVowels(in: "Lambda is really neat.")) // 7