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+1. Short reason string can be used for saving more gas
+
+Every reason string takes at least 32 bytes. Use short reason strings that fits in 32 bytes or it will become more expensive.
+
+Files :
+
+1.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/oracles/PegOracle.sol#L23-L25
+
+2.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/oracles/PegOracle.sol#L28-L31
+
+3.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/SemiFungibleVault.sol#L116-L118
+
+2. Custom Error
+
+Custom Error
+
+Custom errors can be used from Solidity 0.8.4 are cheaper than revert strings. Its cheaper deployment cost and runtime cost when the revert condition is met.
+
+Files :
+
+1.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/oracles/PegOracle.sol#L23-L25
+
+2.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/oracles/PegOracle.sol#L28-L31
+
+3.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/SemiFungibleVault.sol#L91
+
+4.) https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/SemiFungibleVault.sol#L116-L118
+
+3. Removing `uint i = 0` to `uint i`
+
+using this implementation can saving more gas for each loops.
+
+https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/Vault.sol#L443
+
+4. Using `++i` than `i++` for saving more gas
+
+Using `i++` instead `++i` for  all the loops, the variable i is incremented using i++. It is known that implementation by using `++i` costs less gas per iteration than `i++`.
+
+https://github.com/code-423n4/2022-09-y2k-finance/blob/2175c044af98509261e4147edeb48e1036773771/src/Vault.sol#L443 
+