Gas Optimizations

[code423n4]

Removable Variable (miniscule gas cost reduction at deploy time)

• Variable is only written to in the constructor but never used anywhere
  https://github.com/code-423n4/2022-02-concur/blob/72b5216bfeaa7c52983060ebfc56e72e0aa8e3b0/contracts/USDMPegRecovery.sol#L24

Variables that should be immutable (safe costly sloads)

• https://github.com/code-423n4/2022-02-concur/blob/72b5216bfeaa7c52983060ebfc56e72e0aa8e3b0/contracts/USDMPegRecovery.sol#L22
• https://github.com/code-423n4/2022-02-concur/blob/72b5216bfeaa7c52983060ebfc56e72e0aa8e3b0/contracts/StakingRewards.sol#L19
• https://github.com/code-423n4/2022-02-concur/blob/72b5216bfeaa7c52983060ebfc56e72e0aa8e3b0/contracts/StakingRewards.sol#L20

[GalloDaSballo]

1. Remove variable
   Should save the cost of one SSTORE which is 20k gas

2. Make variable immutable
   The warden could have made a killing here had they spent the extra time linking all the instances
   Because they just linked the variables, so will give each of the findings one SLOAD value.
   2100 * 3

Total Gas saved: 26300

Due to the simplicity, the report doesn't require formatting

[GalloDaSballo]

Am changing the way I calculate gas savings to mostly run-time so am removing the 20k gas
New total is 6300