Test: 1021
TPP: expression -> function. Although this is a quite low priority transformation, given the existing code of hundreds, this may be the cleanest transformation at the moment
Test: 9099
TPP: statement -> statements. Similar as case 999
Refactoring, to merge hundreds and thousands, generalize the if condition to use closestCountingUnit(number)
Refactoring, move the condition (number % closestCountingUnit(number) != 0) as a part of return so that the original if condition path can be merged into one