Write a method that returns the "funny sum" of the digits of 'num'. The "funny sum" is found by getting the weighted sum of each digit in the number. The weighting is dependent on the place value of the number. The weight of the digit in the 1's place is 1. The weight of the digit in the 10's place is 2. The weight of the digit in the 100's place is 3. The weights continue to go up by 1 each time the place value gets multiplied by 10. For example, the "funny sum" of 452 is 24 because 2+5+5+4+4+4=24. The 2 had a weight of 1, so it only counted once. The 5 (in the 10's place) had a weight of 2, so it counted twice. The 4 (in the 100's place) had a weight of 3, so it counted three times. Look at the test data for further examples.