Potential reentrance in claimRewards

Judge @GalloDaSballo has assessed the 1st item in QA Report #36 as Medium risk. The relevant finding follows:

…

#POC

            IERC20(_tokens[i]).safeTransfer(msg.sender, getting);
            reward[msg.sender][_tokens[i]] = 0;

Considering there are exterTokens, it is possible that some token will provide reentry opportunities.

Mitigation

change to order of L37 and L38

            reward[msg.sender][_tokens[i]] = 0;
            IERC20(_tokens[i]).safeTransfer(msg.sender, getting);

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