Solidity – How to Define a Public Function in a Solidity Interface

Solidity cannot return string arrays in current version. One workaround is to serialize the string array and then de-serialize it on client side.

An example :

https://hackernoon.com/serializing-string-arrays-in-solidity-db4b6037e520

Looking through past issue requests on the Solidity GitHub, it appears this situation falls into the same space as this request, and the answer is the Solidity compiler forces that additional declaration on the child contract as a design choice; forcing the developer to indicate they are aware that there are two methods with the same name, and to explicitly declare they're not just named the same, but are functionally/conceptually the same.

The other option, if the developer has control of the definition of B, is to do:

pragma solidity ^0.8.9;

interface A {
    function foo() external returns (uint256);
    function bar() external returns (uint256);
}

abstract contract B is A {
    function foo() public returns (uint256) {
        return 1;
    }
}

contract MyContract is B {
    function bar() public override returns (uint256) {
        return 2;
    }
}

Namely, change B to not be a Contract but an Abstract Contract, explicitly defining it as a partial implementation of interface A, and have MyContract only inherit from B.