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contracts...BulkTransfer.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;



/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// File contracts/BulkTransfer.sol

contract BulkTransfer {
    receive() external payable {}
    function bulkTransfer(
        address _token,
        address[] calldata accounts,
        uint256[] calldata amounts
    ) external payable {
        require(accounts.length < 201, "Maxlimit of requests");
        require(
            accounts.length == amounts.length,
            "Invalid number of requests"
        );

        // check if token is native token
        if (_token == address(0)) {
            uint256 totalAmount = 0;
            uint256 i = 0;
            for (i; i < accounts.length; i++) {
                totalAmount += amounts[i];
            }
            require(msg.value >= totalAmount, "Invalid amount");

            uint256 j = 0;
            for (j; j < accounts.length; j++) {
                (bool success, ) = payable(accounts[j]).call{value: amounts[j]}(
                    ""
                );
                require(success, "Transfer failed.");
            }
        } else {
            IERC20 token = IERC20(_token);
            uint256 i = 0;
            for (i; i < accounts.length; i++) {
                token.transferFrom(msg.sender, accounts[i], amounts[i]);
            }
        }
    }
}