Write a function del_rep_vow(s) that has a string s as parameter and returns the string obtained after ruling out all the vowel repetitions. Assume all vowels in s are lowercase.
About statements
The official statement of a problem is always the one
in the PDF document. The HTML version of the statement
is also given to help you, but may contain some content
that is not well displayed. In case of doubt, always use the PDF.