For the Space Tyckiting event, students had to solve a small problem at the sign up. Bonus points were awarded for creativity.
If we list all the natural numbers below 10 that are multiples of 3 or 5,
we get 3, 5, 6 and 9. The sum of these multiples is 23.
Your task is to **write a function** which finds the sum of all the
multiples of 3 or 5 below 1000.