Write a method which has one parameter, a string, and it returns the int number of vowels (a e i o u) in the string.
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Vowels. It should regard a, e, i, o, and u as the vowels.
Case. It should handle both upper and lower case vowels.
No I/O. As usual, this method should do no I/O.
Method header. The method should be defined using this header.
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