Contract Source Code:
File 1 of 1 : AmmoStake
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File: @openzeppelin/contracts/access/Ownable.sol
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// File: contracts/mamstaking.sol
pragma solidity ^0.8.6;
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);
}
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// File: @openzeppelin/contracts/token/ERC721/IERC721.sol
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
}
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b)
internal
pure
returns (bool, uint256)
{
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b)
internal
pure
returns (bool, uint256)
{
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b)
internal
pure
returns (bool, uint256)
{
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b)
internal
pure
returns (bool, uint256)
{
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b)
internal
pure
returns (bool, uint256)
{
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
abstract contract ReentrancyGuard {
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
modifier nonReentrant() {
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
_status = _ENTERED;
_;
_status = _NOT_ENTERED;
}
}
contract AmmoStake is Ownable, IERC721Receiver, ReentrancyGuard {
using SafeMath for uint256;
IERC721 public mam;
IERC721 public mutant;
IERC20 public token;
struct Collection {
uint16[] ids;
uint256 numberStaked;
uint16[] remainingIds;
uint256 tokenStakedAt;
bool daily;
address owner;
}
mapping(uint16 => mapping(address => Collection)) public collection;
mapping(address => uint16) public collectionsByAddress;
mapping(uint16 => address) public collectionsById;
mapping(uint16 => uint256) public totalStakedByCollection;
mapping(address => bool) public blacklistedUsers;
uint256 public dayRate = 1;
uint256 public period = 45; //number of days
uint16 public collectionCount = 1;
uint256 public totalStaked;
uint256 public mutantStaked;
uint256 public amountPaid;
uint256 public decimals = 18;
bool public lockingPeriodEnforced = false;
bool public escapeHatchOpen = false;
event Staked(address indexed, uint256, uint16[]);
event Unstake(address indexed, uint256);
event Payout(address indexed, uint256);
event DayRateChange(uint256);
event PeriodChange(uint256);
constructor(address _token) {
token = IERC20(_token);
}
function onERC721Received(address, address, uint256, bytes calldata) external pure returns (bytes4) {
return IERC721Receiver.onERC721Received.selector;
}
function addNewCollection(address _nft) external onlyOwner {
require(collectionsByAddress[_nft] == 0, "Collection already added");
collectionsByAddress[_nft] = collectionCount;
collectionsById[collectionCount] = _nft;
collectionCount++;
}
function getCollectionById(uint16 _id) external view returns (address){
return collectionsById[_id];
}
function getCollectionByAddress(address _addr) external view returns (uint16){
return collectionsByAddress[_addr];
}
function stake(uint16[] memory tokenIds, uint16 collectionId) external {
require(!blacklistedUsers[msg.sender], "User is blacklisted");
require(collectionsById[collectionId] != address(0), "Invalid collection Id");
IERC721 nft = IERC721(collectionsById[collectionId]);
uint256 quantity = tokenIds.length;
collection[collectionId][msg.sender].tokenStakedAt = block.timestamp;
collection[collectionId][msg.sender].numberStaked+= quantity;
collection[collectionId][msg.sender].owner = msg.sender;
collection[collectionId][msg.sender].daily = false;
totalStakedByCollection[collectionId]+= quantity;
totalStaked+=quantity;
for(uint8 i; i < tokenIds.length; i++) {
collection[collectionId][msg.sender].ids.push(tokenIds[i]);
nft.safeTransferFrom(msg.sender, address(this), tokenIds[i]);
}
emit Staked(msg.sender, quantity, tokenIds);
}
function calculateTime(address _owner, uint16 _type) public view returns (uint256) {
uint256 timeElapsed;
timeElapsed = block.timestamp - collection[_type][_owner].tokenStakedAt;
return timeElapsed;
}
function calculateTokens(address _owner, uint16 _type) external view returns (uint256) {
uint256 _payout;
uint256 time = calculateTime(_owner, _type);
_payout = dayRate * time * collection[_type][_owner].numberStaked;
uint256 totalPayout = _payout *(10**decimals);
return totalPayout.div(86400);
}
function unstakeById(address _owner, uint16 tokenId, uint16 _type) external nonReentrant {
require(!blacklistedUsers[msg.sender], "User is blacklisted");
require(collection[_type][_owner].owner == msg.sender, "Can't unstake someone else's nfts");
require(tokenId != 0, "tokenId cannot be zero");
IERC721 nft = IERC721(collectionsById[_type]);
bool exists = false;
uint256 time = calculateTime(_owner, _type);
uint256 _payout;
if(!collection[_type][_owner].daily && lockingPeriodEnforced) {
require(time >= period*86400, "Staking period has not ended");
}
for(uint8 i; i < collection[_type][_owner].ids.length; i++) {
if(collection[_type][_owner].ids[i] == tokenId) {
nft.transferFrom(address(this), msg.sender, tokenId);
delete collection[_type][_owner].ids[i];
exists = true;
}
}
if(exists) {
totalStaked--;
totalStakedByCollection[_type]--;
collection[_type][_owner].numberStaked--;
_payout = dayRate * time;
uint256 totalPayout = _payout *(10**decimals);
uint256 totalPayoutPS = totalPayout.div(86400);
amountPaid+= totalPayoutPS;
token.transfer(msg.sender, totalPayoutPS);
collection[_type][_owner].daily = true;
collection[_type][_owner].tokenStakedAt = block.timestamp;
emit Unstake(msg.sender, totalPayout);
} else {
revert("tokenId not staked or nonexistent");
}
}
function payout(address _owner, uint16 _type) external nonReentrant {
require(!blacklistedUsers[msg.sender], "User is blacklisted");
require(collection[_type][_owner].owner == msg.sender, "Can't initiate someone else's payout");
uint256 time = calculateTime(_owner, _type);
uint256 _payout = dayRate * time * collection[_type][_owner].numberStaked;
if(!collection[_type][_owner].daily && lockingPeriodEnforced) {
require(time >= period*86400, "Staking period has not ended");
}
uint256 totalPayout = _payout *(10**decimals);
uint256 totalPayoutPS = totalPayout.div(86400);
amountPaid+= totalPayoutPS;
token.transfer(_owner, totalPayoutPS);
collection[_type][_owner].daily = true;
collection[_type][_owner].tokenStakedAt = block.timestamp;
emit Payout(_owner, totalPayout);
}
function unstake(address _owner, uint16 _type) external nonReentrant {
require(!blacklistedUsers[msg.sender], "User is blacklisted");
require(collection[_type][_owner].owner == msg.sender, "Can't unstake someone else's nfts");
IERC721 nft = IERC721(collectionsById[_type]);
uint256 time = calculateTime(_owner, _type);
uint256 _payout = dayRate * time * collection[_type][_owner].numberStaked;
if(!collection[_type][_owner].daily && lockingPeriodEnforced) {
require(time >= period*86400, "Staking period has not ended");
}
for(uint8 i; i< collection[_type][_owner].ids.length; i++) {
if(collection[_type][_owner].ids[i] != 0) {
collection[_type][_owner].remainingIds.push(collection[_type][_owner].ids[i]);
}
}
for(uint8 i; i < collection[_type][_owner].remainingIds.length; i++) {
nft.transferFrom(address(this), msg.sender, collection[_type][_owner].remainingIds[i]);
}
uint256 totalPayout = _payout *(10**decimals);
uint256 totalPayoutPS = totalPayout.div(86400);
amountPaid+= totalPayoutPS;
token.transfer(msg.sender, totalPayoutPS);
totalStaked-=collection[_type][_owner].numberStaked;
totalStakedByCollection[_type] -= collection[_type][_owner].numberStaked;
delete collection[_type][_owner];
emit Unstake(msg.sender, totalPayoutPS);
}
function setTokenAddress(address _newToken) external onlyOwner {
token = IERC20(_newToken);
}
function setDayRate(uint256 _newRate) external onlyOwner {
require(_newRate != 0, "rate cannot be zero");
dayRate = _newRate;
emit DayRateChange(_newRate);
}
function enforceLockingPeriod(bool _state) external onlyOwner {
lockingPeriodEnforced = _state;
}
/* This function can be triggered if for some reason holders are unable to
unstake their nfts.*/
function openEscapeHatch(bool _state) external onlyOwner {
escapeHatchOpen = _state;
}
/* EscapeHatchWithdrawal should only be called as a last resort if the contract is hacked or compromised
* in any way. It is designed to allow the user to withdraw NFTs by id at minimum cost and without regard
* for updating states or any other actions that would cause the function to be more expensive. Only use
* this function if you do not plan on using this contract any further.
*Note: escapeHatchOpen must first be set to true by the owner.
*@param _owner - user address
*@param _type - collectionId
*@param _ids - array containing tokenIds belonging to user
*/
function escapeHatchWithdrawal(address _owner, uint8 _type, uint16[] calldata _ids) external {
require(escapeHatchOpen, "Escape hatch is closed");
IERC721 nft = IERC721(collectionsById[_type]);
require(collection[_type][_owner].owner == msg.sender, "Can't unstake someone else's nft");
for(uint8 i; i < _ids.length; i++) {
nft.transferFrom(address(this), _owner, _ids[i]);
}
}
function setPeriod(uint256 _time) external onlyOwner {
period = _time;
emit PeriodChange(_time);
}
function getEligibility(address _owner, uint8 _type) external view returns(bool) {
bool eligible;
eligible = collection[_type][_owner].daily;
return eligible;
}
function setRewardEligible(address _owner, uint8 _type, bool _state) external onlyOwner {
collection[_type][_owner].daily = _state;
}
function getNumberStaked(address _owner, uint16 _type) external view returns (uint256){
return collection[_type][_owner].numberStaked;
}
function getIds(address _owner, uint16 _type) external view returns (uint16[] memory){
return collection[_type][_owner].ids;
}
function blacklistUser(address _owner) external onlyOwner {
blacklistedUsers[_owner] = true;
}
function removeFromBlacklist(address _owner) external onlyOwner {
blacklistedUsers[_owner] = false;
}
function emergencyTokenWithdraw() external onlyOwner {
uint256 balance = token.balanceOf(address(this));
token.transfer(msg.sender, balance );
}
//This is to remove the native currency of the network (e.g. ETH, BNB, MATIC, etc.)
function emergencyWithdraw() public onlyOwner nonReentrant {
// This will payout the owner the contract balance.
// Do not remove this otherwise you will not be able to withdraw the funds.
// =============================================================================
(bool os, ) = payable(owner()).call{value: address(this).balance}("");
require(os);
// =============================================================================
}
receive() external payable {}
}