First Flight #20: The Predicter

Summary

Add immutable for some variables, which can save more gas

Vulnerability Details

take variables as immutable, which means the varaibels store in the contract's code instead of storage space.

Impact

Cost more gas

Tools Used

slither

Recommendations

For the unchanged variables, add immutable

ScoreBoard.owner (src/ScoreBoard.sol#21) should be immutable
ThePredicter.entranceFee (src/ThePredicter.sol#21) should be immutable
ThePredicter.organizer (src/ThePredicter.sol#19) should be immutable
ThePredicter.predictionFee (src/ThePredicter.sol#22) should be immutable
ThePredicter.scoreBoard (src/ThePredicter.sol#23) should be immutable