Challenge: Count the Number of Vowels in a String

Write a recursive function that counts the number of vowels in a given string.

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Write a program that defines a recursive function counts_vowels() that accepts a string and counts the number of vowels in the string:

  • Input: A string s, an index idx (initially 0 a), and count (initially 0).
  • Output: The number of vowels in the input string.

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