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contracts-live...lottery-contract.sol

//SPDX-License-Identifier: GPL-3.0

pragma solidity >= 0.7.0 < 0.8.18;

contract Lottery{

    address public manager;
    address payable[] public players;

    constructor(){
        manager =  msg.sender;
    }

    function alreadyEntered() private view returns(bool){
        for(uint i=0;i<players.length;i++){
            if(players[i]==msg.sender)
                return true;
        }
        return false;
    }
    function entered() public payable{
        require(msg.sender != manager, "Manager can't participate in lottery");
        require(alreadyEntered()==false,"Player already participated for lottery");
        require(msg.value >= 1 ether,"Minimum amount must be paid to participate in lottery");

        players.push(payable(msg.sender));
    } 
    function random() public view returns(uint){
        return uint(sha256(abi.encodePacked(block.difficulty,block.number,players)));
    }

    function pickWinner() public{
        require(manager == msg.sender,"Only manager can picked the winner");
        uint index = random()%players.length;  //winner index
        address contractAddress = address(this);
        players[index].transfer(contractAddress.balance);
        players = new address payable[](0);

    }

    function getPlayers() public view returns(address payable[] memory){
        return players;
    }

}