Function round_up
pub fn round_up(d: &mut [u8]) -> Option<u8>When d contains decimal digits, increase the last digit and propagate carry.
Returns a next digit when it causes the length to change.
round_uppub fn round_up(d: &mut [u8]) -> Option<u8>When d contains decimal digits, increase the last digit and propagate carry.
Returns a next digit when it causes the length to change.