Rite a function vowel indicates that takes a string as a parameter and returns a list of the indices of all vowels in the string. A vowel is one of a, e, i, o, or u. Capitalization should not matter when finding the indices, meaning that upper- and lowercase vowels should have their indices accumulated into the list. If there are no vowels in the string, the empty list should be returned. A correct solution to this problem will use an indexed loop (i. e. one involving a call to range to get the indices of the string) and not use the index function or equivalent.