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Gas01: Public functions can be marked external. (12 instances)

Gas02: Functions guaranteed to revert when called by normal users can be marked payable.

If a function modifier or require such as onlyOwner/onlyX is used, the function will revert if a normal user tries to pay the function. Marking the function as payable will lower the gas cost for legitimate callers because the compiler will not include checks for whether a payment was provided. The extra opcodes avoided are CALLVALUE(2), DUP1(3), ISZERO(3), PUSH2(3), JUMPI(10), PUSH1(3), DUP1(3), REVERT(0), JUMPDEST(1), POP(2) which costs an average of about 21 gas per call to the function, in addition to the extra deployment cost.

Gas03: Optimize names to save gas. Contracts most called functions could simply save gas by function ordering via Method ID. Calling a function at runtime will be cheaper if the function is positioned earlier in the order (has a relatively lower Method ID) because 22 gas are added to the cost of a function for every position that came before it. The caller can save on gas if you prioritize most called functions. Find a lower method ID name for the most called functions for example Call() vs. Call1() is cheaper by 22 gas.

Gas04: <x> += <y> Costs More Gas Than <x> = <x> + <y> For State Variables. (13 instances)

Gas05: Some state variables can be private instead of public.

Gas06: for loop length should be cached instead of reading from storage every time. ++i/i++ should be unchecked{++i}/unchecked{i++} when it is not possible for them to overflow.