Write a function called cleanup to tidy up a sentence and produce a string scalar. in the input sentence, some words are separated by more than one space. the output should produce single spaces between words. spaces should not appear at the beginning or end of the output sentence. the input sentence is a string scalar and the output sentence is a string scalar. restriction: the function must use join, split, and strip. hint: separate the words in the input sentence into a string array, manipulate the resulting string scalars, and then reconstruct the output string scalar. ex: