#[unsafe(no_mangle)]pub extern "C" fn orderbook_get_quantity_for_price(
book: &mut OrderBook_API,
price: Price,
order_side: OrderSide,
) -> f64#[unsafe(no_mangle)]pub extern "C" fn orderbook_get_quantity_for_price(
book: &mut OrderBook_API,
price: Price,
order_side: OrderSide,
) -> f64