Given a variable s that is associated with non-empty empty string, write some statements that use a while loop to associate a variable vowel_count

Given a variable s that is associated with non-empty empty string, write some statements that use a while loop to associate a variable vowel_count with the number of lower-case vowels ("a","e","i","o","u") in the string .Instructor Notes:The phrase "non-empty empty string" should be "a non-empty or empty string".