Question: Write a method public static int countVowels(String str) that returns a count of all vowels in the string str. Vowels are the letters a, e,

Write a method public static int countVowels(String str) that returns a count of all vowels in the string str. Vowels are the letters a, e, i, o, and u, and their uppercase variants. Use a helper method isVowel that checks whether a character is a vowel.

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