Random tests with numbers > 1000 sometimes expect the wrong format:

1234 expect '1234' but the correct solution would be '1.234'

Also: a valid currency-string should always have 2 decimals, so the above should actually be

1234 -> '1.234,00'

The supplied testcases truncate the decimals if they end with a 0:

'.10' becomes '.1' and '.00' gets removed alltogether