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• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•    - function ceil(uint a, uint m)
•  contract Owned
•    - function transferOwnership(address pa ...
• interface IToken
•    - function transfer(address to, uint256 ...
•    - function burnTokens(uint256 _amount)
•    - function balanceOf(address tokenOwner ...
•  contract Presale is Owned *
•    - function startPresale()
•    - function closePrsale()
•    - function setTokenAddress(address toke ...
•    - function setTokenDecimals(uint256 dec ...
•    - function setMinEthLimit(uint256 amoun ...
•    - function setMaxEthLimit(uint256 amoun ...
•    - function setTokenRatePerEth(uint256 r ...
•    - function setRateDecimals(uint256 deci ...
•    - function getTokensPerEth(uint256 amou ...
•    - function burnUnsoldTokens()
•    - function getUnsoldTokens()

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/**
 *Submitted for verification at Etherscan.io on 2020-12-30
*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.0;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 *
*/

library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }

  function ceil(uint a, uint m) internal pure returns (uint r) {
    return (a + m - 1) / m * m;
  }
}

// ----------------------------------------------------------------------------
// Owned contract
// ----------------------------------------------------------------------------
contract Owned {
    address payable public owner;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address payable _newOwner) public onlyOwner {
        owner = _newOwner;
        emit OwnershipTransferred(msg.sender, _newOwner);
    }
}


// ----------------------------------------------------------------------------
// ERC Token Standard #20 Interface
// ----------------------------------------------------------------------------
interface IToken {
    function transfer(address to, uint256 tokens) external returns (bool success);
    function burnTokens(uint256 _amount) external;
    function balanceOf(address tokenOwner) external view returns (uint256 balance);
}


contract Presale is Owned {
    using SafeMath for uint256;
    
    bool public isPresaleOpen;
    
    //@dev ERC20 token address and decimals
    address public tokenAddress;
    uint256 public tokenDecimals = 18;
    
    //@dev amount of tokens per ether 100 indicates 1 token per eth
    uint256 public tokenRatePerEth = 500000_00;
    //@dev decimal for tokenRatePerEth,
    //2 means if you want 100 tokens per eth then set the rate as 100 + number of rateDecimals i.e => 10000
    uint256 public rateDecimals = 2;
    
    //@dev max and min token buy limit per account
    uint256 public minEthLimit = 500 finney;
    uint256 public maxEthLimit = 3 ether;
    
    mapping(address => uint256) public usersInvestments;
    
    constructor() public {
        owner = msg.sender;
    }
    
    function startPresale() external onlyOwner{
        require(!isPresaleOpen, "Presale is open");
        
        isPresaleOpen = true;
    }
    
    function closePrsale() external onlyOwner{
        require(isPresaleOpen, "Presale is not open yet.");
        
        isPresaleOpen = false;
    }
    
    function setTokenAddress(address token) external onlyOwner {
        require(tokenAddress == address(0), "Token address is already set.");
        require(token != address(0), "Token address zero not allowed.");
        
        tokenAddress = token;
    }
    
    function setTokenDecimals(uint256 decimals) external onlyOwner {
       tokenDecimals = decimals;
    }
    
    function setMinEthLimit(uint256 amount) external onlyOwner {
        minEthLimit = amount;    
    }
    
    function setMaxEthLimit(uint256 amount) external onlyOwner {
        maxEthLimit = amount;    
    }
    
    function setTokenRatePerEth(uint256 rate) external onlyOwner {
        tokenRatePerEth = rate;
    }
    
    function setRateDecimals(uint256 decimals) external onlyOwner {
        rateDecimals = decimals;
    }
    
    receive() external payable{
        require(isPresaleOpen, "Presale is not open.");
        require(
                usersInvestments[msg.sender].add(msg.value) <= maxEthLimit
                && usersInvestments[msg.sender].add(msg.value) >= minEthLimit,
                "Installment Invalid."
            );
        
        //@dev calculate the amount of tokens to transfer for the given eth
        uint256 tokenAmount = getTokensPerEth(msg.value);
        
        require(IToken(tokenAddress).transfer(msg.sender, tokenAmount), "Insufficient balance of presale contract!");
        
        usersInvestments[msg.sender] = usersInvestments[msg.sender].add(msg.value);
        
        //@dev send received funds to the owner
        owner.transfer(msg.value);
    }
    
    function getTokensPerEth(uint256 amount) internal view returns(uint256) {
        return amount.mul(tokenRatePerEth).div(
            10**(uint256(18).sub(tokenDecimals).add(rateDecimals))
            );
    }
    
    function burnUnsoldTokens() external onlyOwner {
        require(!isPresaleOpen, "You cannot burn tokens untitl the presale is closed.");
        
        IToken(tokenAddress).burnTokens(IToken(tokenAddress).balanceOf(address(this)));   
    }
    
    function getUnsoldTokens() external onlyOwner {
        require(!isPresaleOpen, "You cannot get tokens until the presale is closed.");
        
        IToken(tokenAddress).transfer(owner, IToken(tokenAddress).balanceOf(address(this)) );
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"burnUnsoldTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"closePrsale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getUnsoldTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isPresaleOpen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxEthLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minEthLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rateDecimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"setMaxEthLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"setMinEthLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"decimals","type":"uint256"}],"name":"setRateDecimals","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"setTokenAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"decimals","type":"uint256"}],"name":"setTokenDecimals","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"rate","type":"uint256"}],"name":"setTokenRatePerEth","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startPresale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenDecimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenRatePerEth","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address payable","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"usersInvestments","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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