Lottery contract

lottery.sol

pragma solidity ^0.4.17;

contract Lottery {
    address public manager;
    address[] public players;
    
    constructor() public {
        manager = msg.sender;
    }
    
    function enter() public payable {
        require(msg.value > .01 ether);
        
        players.push(msg.sender);
    }
    
    function random() private view returns (uint256) {
        return uint(keccak256(abi.encodePacked(block.difficulty, now, players)));
    }
    
    function pickWinner() public {
        // Make sure the winner is picked by the manager not anyone else
        require(msg.sender === manger);
        
        uint index = random() % players.length;
        players[index].transfer(address(this).balance);
        players = new address[](0)
    }
}