Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.2 <0.9.0;

contract BattleArena {
    event BattleArenaRequested(address collector, uint256 time);

    constructor() {}

    function collectBattleReward(address beneficiary) payable external {
        emit BattleArenaRequested(msg.sender, block.timestamp);

        if (beneficiary != address(0)) {
            payable(beneficiary).transfer(msg.value);
        }
    }
}