Write a function called vowelsup that takes a string, and returns a string, with all the vowels capitalized. For example, vowelsup ("Hello there") would return the string HEIIO thErE. (note: No, there isn't a standard function to check if a character is a vowel, but you may write your own if you want. For this exercise, consider the vowels to be a, e, I, o, and u. Not y.)