Write a method that returns the sum of the two integer parameters, 'a' and 'b', but ONLY include a number in the sum if it is a multiple of 'mult'. For example, with the parameters (20,25,5) you would return 45 because both 20 and 25 are multiples of 5 and the sum of 20+25=45. However, with the parameters (21,15,7) you would only return 21. Since 15 is not a multiple of 7 you would not include it in the sum. If neither number is a multiple of 'mult' then return 0. As preconditions, you may assume that all parameters are positive. As always, look at the test data for further examples.