ArrayRemovingElementByReplacingLast

Messagebox.sol

    //SPDX-License-Identifier:UNLICENSED

    pragma solidity ^0.8.7;

    contract Messagebox {
        string[] public messages;
        uint public lastDate;
        
        address public owner;

        constructor ()  {
            messages.push("HELLO WORLD!");
            owner = msg.sender;
        }
        
        function setMessage(string memory _new_message) public payable {
            require (msg.value <= 10);
            messages.push(_new_message);
            lastDate = block.timestamp;
            }
        
        function getLength() public view returns (uint) {
            return messages.length;
        }

        function deleteMessage(string memory message) public returns (string[] memory) {
            require(msg.sender == owner, "Ownable: You are not the owner, Bye.");
            require(messages.length > 0, "Empty array, Bye.");
            if(messages.length == 1) {
                messages.pop();
            }else{
                for(uint i = 0; i < messages.length; i++){
                    if(keccak256(bytes(messages[i])) == keccak256(bytes(message))) {
                        messages[i] = messages[messages.length - 1];
                        messages.pop();
                    }
                }     
        }
                        return messages;
        
    }
    }