Warning: Function state mutability can be restricted to pure function

Question

I am new to solidity and I have been trying to print out simple messages using functions in solidity, but I have failed to deploy successfully, and there is an error that I can not figure out what's wrong.

This is what I have tried so far:

 pragma solidity ^0.6.0;
    
    contract test {
        
        string public _feedback;
        
        function reply(string memory feedback) public
        {
           feedback = "Well done!";
        }
    }

The error I am receiving is "Warning: Function state mutability can be restricted to pure function"

Answer 1

The compiler simply WARNS that the result of the execution of the function reply is fixed and "canonically" this can be indicated by adding a pure specifier to it:

        function reply(string memory feedback) public pure
        {
           feedback = "Well done!";
        }

But even without this change, the contract will be compiled and created correctly. Only in its current form, you will not be able to understand in any way what it is working out :-)