https://github.com/code-423n4/2022-12-tigris/blob/main/contracts/Trading.sol#L14-L77
https://github.com/code-423n4/2022-12-tigris/blob/main/contracts/StableVault.sol#L9-L13
https://github.com/code-423n4/2022-12-tigris/blob/main/contracts/StableVault.sol#L15-L25
