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