Write a function to determine if an input word contains single vowel or not. The function should return true if word contains only one vowel. You can assume all the letters in the word are in lowercase. For example singleVowelWord(cat) should return true, while singleVowelWord(tomorrow) should return false. (Hint: your program needs to count the number of vowels in the word. It should return true if the count is equal to one, false otherwise). The function prototype is given as the following: bool singleVowelWord(string word); C+++