reverse_string
that takes in as argument a string, and reverses the order of characters in that string. Note that your function should modify the argument string, not create and return a new string.
count_vowels
that takes in as argument a string, and returns the number of vowels in the string. Both uppercase vowels and lowercase vowels should be counted.
lower_case
that takes in as argument a string, and modifies the string so that all letters are converted to lowercase. Non-letter characters should not be changed.
separate
that takes in as argument a string, and modifies the string so that:
squares
that takes in as arguments an array of integers and the length of that array, and modifies the array so that each integer in the array is replaced with the square of that integer.
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