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95function claim() external override whenNotPaused {
96    uint256 _index = lastClaimedRewardPeriod + 1;
97    uint256 _rewardPeriodCount = donationMiner.rewardPeriodCount();
98
99    uint256 _rewardPerBlock;
100    uint256 _startBlock;
101    uint256 _endBlock;
102    uint256 _claimAmount;
103
104    while (_index <= _rewardPeriodCount) {
105        (_rewardPerBlock, , _startBlock, _endBlock, ) = donationMiner.rewardPeriods(_index);
106
107        if (_endBlock >= block.number) {
108            _rewardPeriodCount--;
109            break;
110        }
111
112        _claimAmount += ((_endBlock - _startBlock + 1) * _rewardPerBlock * 3) / 4;
113        _index++;
114    }
115
116    // if advancePayment is zero it means that all the entire amount payed in advance has been covered
117    if (advancePayment == 0) {
118        transferToImpactLabs(_claimAmount);
119    } else if (advancePayment >= _claimAmount) {
120        // if the claim amount is lesser than the amount of PACTs that is still given in advance
121        // it decrease advancePayment value
122        // it doesn't transfer PACTs to ImpactLabs
123        advancePayment -= _claimAmount;
124        emit AdvancePaymentDecreased(_claimAmount, advancePayment);
125    } else {
126        // if the claim amount is greater than the amount of PACTs that is still given in advance
127        // it decrease advancePayment to 0
128        // it transfer the difference to ImpactLabs
129        uint256 toTransfer = _claimAmount - advancePayment;
130        advancePayment = 0;
131
132        emit AdvancePaymentDecreased(_claimAmount - toTransfer, 0);
133        transferToImpactLabs(toTransfer);
134    }
135
136    lastClaimedRewardPeriod = _rewardPeriodCount;
137}

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139/**
140 * @notice Transfers an amount of an ERC20 from this contract to an address
141 *
142 * @param _token address of the ERC20 token
143 * @param _to address of the receiver
144 * @param _amount amount of the transaction
145 */
146function transfer(
147    IERC20 _token,
148    address _to,
149    uint256 _amount
150) external override onlyOwner nonReentrant {
151    _token.safeTransfer(_to, _amount);
152
153    emit TransferERC20(address(_token), _to, _amount);
154}