Quickfix to add 'virtual' and 'override' to function

[Aniket-Engg]

related to #3927

It shows quickfix for compilation errors like:
TypeError: Trying to override non-virtual function. Did you forget to add "virtual"
&
TypeError: Overriding function is missing "override" specifier

code to reproduce these errors:

pragma solidity 0.8.18;

contract Store {
    function store(uint256 num) public {
        num = num + 1;
    }
}

contract Storage is Store {
    function store(uint256 num) public {
        num = num + 2;
    }
}

This PR also involves some code refactoring

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[LianaHus]

IMHO it should do the opposite thing. instead of updating the file to the current version we should update the current version to the acceptable one.