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Below is something resembling the order library code for Sail Exchange:
order.sw
    library;


    abi OrderSettler {
        fn take(id:u64, order: LimitOrder);
        fn make(id:u64, order: LimitOrder);
        fn cancel(id:u64, order: LimitOrder);
    }

    pub struct LimitOrder {
        maker_token: b256,
        taker_token: b256,
        maker_amount: u64,
        taker_amount: u64,
        maker: Address,
    }