Write a method called factSum that return the sum of the digits of the factorial of the positive integer input parameter. Recall that the factorial of a number is the product of all the positive integers less than or equal to that number. For example, 4! (four factorial) means 1*2*3*4 which equals 24. So factSum(4) returns 6 because the sum of the digits of 24 is 6. Factorials get very large very fast. Your program needs to work for factorials that are less than the largest long integer. The sum should be returned as an integer as the sum will be much less than the actual factorial.