9th commit refactor - add private function to handle multiple numbers
10th commit - test for 2 numbers with comma - different then "1,2" -
green
11th commit - test handle an unknown amount of numbers - red
12th commit - function handle unknown amount of numbers - green
13th commit - test for string with new lines - red
14th commit - function to handle new lines with the commas - green
15th commit - test for supporting different delimiters - red