Claim Rewards

This function transfers the rewards earned by msg.sender and then resets the value of rewards storage variable to zero.

function claimRewards() public updateReward(msg.sender) {
    uint256 reward = rewards[msg.sender];
    if (reward > 0) {
        delete rewards[msg.sender];

        rewardERC20Token.safeTransfer(msg.sender, reward);

        emit RewardPaid(msg.sender, reward);
    }
}