write in python. must use while loop

Question 1: Mix up Filename: mix_up.py Write a function that accepts two strings of equal length and returns a strings where the characters of the strings have been mixed together. For example, if "hello" and "world" are passed into your function, "hweolrllod" should be returned. Write a main() function in your file to exercise your function to show that it works correctly. Your test implementation should not rely on visual inspection to determine if the tests pass