The provided Solidity smart contract has a few errors and can be optimized. Here's the corrected and optimized version:
Here are the corrections and optimizations:
The version of the Solidity compiler is not specified, which is a potential security risk. It's recommended to always specify a fixed version of the compiler. I've updated it to ^0.8.0.
The onlyOwner modifier was not closed with _;, which is necessary to denote where the rest of the function being modified should be inserted.
In your markAsCompleted and markAsNotCompleted functions, you forgot to set isCompleted to true and false respectively.
The getResolution and getCompletionStatus functions are not necessary because the resolutionText and isCompleted variables are declared as public, which means Solidity automatically creates getter functions for them.
The setResolution function can be optimized by making the _text parameter a calldata type to save gas. However, this is only applicable if you're using Solidity 0.5.0 or later.
Lastly, there's a syntax error at =F, which I've removed.
Remember that smart contracts are immutable once they're deployed, so it's crucial to ensure your contract is error-free and optimized before deployment.