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   - function totalSupply()    - function balanceOf(address tokenOwner ...    - function allowance(address tokenOwner ...    - function transfer(address to, uint256 ...    - function approve(address spender, uin ...    - function transferFrom(  contract SafeMath    - function safeAdd(uint256 a, uint256 b ...    - function safeSub(uint256 a, uint256 b ...  contract cheerscoin is IERC20, Saf ... *    - function allowance(address tokenOwner ...    - function approve(address spender, uin ...    - function transfer(address to, uint256 ...    - function transferFrom(    - function totalSupply()    - function balanceOf(address tokenOwner ...    - function burn(uint256 _amount)

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/**
 *Submitted for verification at Etherscan.io on 2021-07-29
*/

pragma solidity 0.6.0;

abstract contract IERC20 {
    function totalSupply() public view virtual returns (uint256);

    function balanceOf(address tokenOwner)
        public
        view
        virtual
        returns (uint256);

    function allowance(address tokenOwner, address spender)
        public
        view
        virtual
        returns (uint256);

    function transfer(address to, uint256 tokens) public virtual returns (bool);

    function approve(address spender, uint256 tokens)
        public
        virtual
        returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 tokens
    ) public virtual returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 tokens);
    event Approval(
        address indexed tokenOwner,
        address indexed spender,
        uint256 tokens
    );
}

contract SafeMath {
    function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;
        return c;
    }
}

contract cheerscoin is IERC20, SafeMath {
    string public name;
    string public symbol;
    uint8 public decimals;

    uint256 public _totalSupply;
    address public owner = 0x39269FC3Ce8059dCfAF92138FcAe38bF2E326226;

    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;

    constructor() public payable {
        name = "cheerscoin";
        symbol = "CHC";
        decimals = 18;
        _totalSupply = 2000000000 * 10**uint256(decimals);
        balances[owner] = _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    function allowance(address tokenOwner, address spender)
        public
        view
        virtual
        override
        returns (uint256 remaining)
    {
        return allowed[tokenOwner][spender];
    }

    function approve(address spender, uint256 tokens)
        public
        virtual
        override
        returns (bool success)
    {
        require(tokens >= 0, "Invalid value");
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        return true;
    }

    function transfer(address to, uint256 tokens)
        public
        virtual
        override
        returns (bool success)
    {
        require(to != address(0), "Null address");
        require(tokens > 0, "Invalid Value");
        balances[msg.sender] = safeSub(balances[msg.sender], tokens);
        balances[to] = safeAdd(balances[to], tokens);
        emit Transfer(msg.sender, to, tokens);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokens
    ) public virtual override returns (bool success) {
        require(to != address(0), "Null address");
        require(from != address(0), "Null address");
        require(tokens > 0, "Invalid value");
        require(tokens <= balances[from], "Insufficient balance");
        require(tokens <= allowed[from][msg.sender], "Insufficient allowance");
        balances[from] = safeSub(balances[from], tokens);
        allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
        balances[to] = safeAdd(balances[to], tokens);
        emit Transfer(from, to, tokens);
        return true;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address tokenOwner)
        public
        view
        virtual
        override
        returns (uint256 balance)
    {
        return balances[tokenOwner];
    }

    function burn(uint256 _amount) public returns (bool) {
        require(_amount >= 0, "Invalid amount");
        require(owner == msg.sender, "UnAuthorized");
        require(_amount <= balances[msg.sender], "Insufficient Balance");
        _totalSupply = safeSub(_totalSupply, _amount);
        balances[owner] = safeSub(balances[owner], _amount);
        emit Transfer(owner, address(0), _amount);
        return true;
    }
}

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