function donate(IERC20 _token, uint256 _amount) external {
    require(activated[_token] != 0, "!activated");
    savedTokens[_token] += _amount;
    // @audit fee-on-transfer. then fails for last person in `withdraw`
    _token.safeTransferFrom(msg.sender, address(this), _amount);
}

function withdraw(IERC20 _token, address _to) external override {
    // @audit percentage on storage var, not on actual balance
    uint256 amount = savedTokens[_token] * client.shareOf(_token, msg.sender) / client.totalShare(_token);
    // @audit amount might not be in contract anymore as savedTokens[_token] is over-reported
    _token.safeTransfer(_to, amount);
}
