Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.18+commit.87f61d96.js&optimize=false&runs=200&gist=

contracts...corrections...Devinez2.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.18;
import "@openzeppelin/contracts/access/Ownable.sol";
contract epargne is Ownable {
  string private mot;
  string public indice;
  address public gagnant;
  mapping(address=>bool) played;
  address[] public players;

  function setMot(string memory _mot, string memory _indice) public onlyOwner{
    mot=_mot;
    indice=_indice;
  }

  function getWinner() view public returns (string memory){
    if(gagnant==address(0)){
      return "Pas encore de gagnant!";
    }
    else {
      return "Il y a un gagnant!";
    }
  }

  function playWord(string memory _try) public returns (bool) {
    require(played[msg.sender]==false, "t'as deja joue");
    if (
      keccak256(abi.encodePacked(_try)) == keccak256(abi.encodePacked(mot))
    ){
      gagnant=msg.sender;
      played[msg.sender]=true;
      players.push(msg.sender);
      return true;
    }
    else {
      played[msg.sender]=true;
      players.push(msg.sender);
      return false;
    }
  }

  function reset(string memory _mot, string memory _indice) public onlyOwner{
    uint tailleTableau=players.length;
    address tempPlayers;
    for (uint i=tailleTableau-1; i>0; i--){
      tempPlayers=players[i];
      played[tempPlayers]=false;
      players.pop();
    }
    gagnant = address(0);
    setMot(_mot, _indice);
  }
}