Function offset_simplify_clean 

pub unsafe extern "C" fn offset_simplify_clean(
    polygons: Polygons,
    miter_limit: f64,
    round_precision: f64,
    join_type: JoinType,
    end_type: EndType,
    delta: f64,
    fill_type: PolyFillType,
    distance: f64,
) -> Polygons