let required_length = ROOMLENGTH - row.get_coverage();

            length if length > (ROOMLENGTH - row.get_coverage()) => {

            length if length > (required_length) => {

                let (plankpart, leftover) = plank.cut_to_length(ROOMLENGTH - row.get_coverage());

                let (plankpart, leftover) = plank.cut_to_length(required_length);

            length if length == (ROOMLENGTH - row.get_coverage()) => {

            length if length == (required_length) => {