The first market index is number 1, rather than 0. https://github.com/code-423n4/2022-09-y2k-finance/blob/main/src/VaultFactory.sol#L195
https://github.com/code-423n4/2022-09-y2k-finance/blob/main/src/Vault.sol#L196
Standard mathematical operations reverts if an invalid operation occurs in solidity ^0.8, which means the library is deprecated.
https://github.com/code-423n4/2022-09-y2k-finance/blob/main/src/rewards/StakingRewards.sol#L4
Function takes 7 arguments, however the @dev comment for _name is missing
https://github.com/code-423n4/2022-09-y2k-finance/blob/main/src/VaultFactory.sol#L169-L174