Write method getDigitSum. getDigitSum will calculate the number of digits for both integer parameters and then return the sum of the two calculated values. You MUST call method getDigitCount() from part A and assume that it works as intended regardless of what you wrote. The call getDigitDifference(43,512) would return 5. The call getDigitDifference(7145,72) would return 6. The call getDigitDifference(123,321) would return 6. The call getDigitDifference(861237,1) would return 7.