pragma solidity ^0.5.16;

/**
 ********************************************************************
 *      e-finance.io - DeFi made for Exponential Growth $EFI
 ********************************************************************
 *
 * $$$$$$$$$$$$$$$$$$$$$$$B$MkT]v)rrr?viuobg#$$$$$$$$$$$$$$$$$$$$$$$
 * $$$$$$$$$$$$$$$$$$BMT*:-_:~*)vxx]xxv)*;:__!)Vd#$$$$$$$$$$$$$$$$$$
 * $$$$$$$$$$$$$$#OY!-,~vTyjIIIXzkkkkkzoXoozyTv<:_<c0$$$$$$$$$$$$$$$
 * $$$$$$$$$$$$Qx,-=vVIsIwVuulllllTTx^!:=rluVyjXjVv~_!l#$$$$$$$$$$$$
 * $$$$$$$$$#a!.<}ImjVulTTlllTTTTlT<  `.` :TTlTluckXz}^-^b$$$$$$$$$$
 * $$$$$$$$G:.~TKIVullllllllTTTTTlx` ~}lx- rTlllllTuVzIT^-<9$$$$$$$$
 * $$$$$$Q^`!}KscllTTTTTTTTTTTTTTl* `LlTT^ ~lTTTTlllTluoX}~-vB$$$$$$
 * $$$$$3.-(UKyulTTTTTTlTTlllllTTl< -}Tll]*xllllllTlllllVIkv,"9$$$$$
 * $$$#r`=yPwuTlTTTTTTTluTTlllllTT~ .i}}}TTlllllllllllllTlyUc<.T$$$$
 * $$#*`~zPyulTTTTTTTTTlTL)^!,_.'``  `````'.-_,:!>LllTlllTlVhy*'T$$$
 * $$L`=wPVlllTTTTllllx~-` `_!~^*r: ')?()r*^;=!:__xuTTllllllVsV<'e$$
 * $Z`_}WwllllTTTTllT~`  _rYllTTTl< -}TlllllTllllllTTTlTTTTTlys}:-Q$
 * #:')HoullllTTTTTlr   ,TTlllllll< -}TllTlllTTlTlTTlTTTTTTlllkIv-)$
 * M "VWVlllTTTTTTllv`  -Lllllllll< -}TlTTTTTTTTTTTTTTTTTTTlTlcsu!.8
 * } ~eKulllTTTTTTTllr.  .>xTllTTl< -}TlTTTTTTTTTTTTTTTTTTTllluIk*`K
 * )`^3IulTTTTTTTTTTTT}r!-` `,:=>^" `******^xTTTTTTTTTTTTTTllllzX)`c
 * r`^PIuTTTTTTTTTllllTx*=".` `.-_' `______-rTTTTTTTTTTTTTTTTllzX)`u
 * i`~meuTTlTTTTTTTl}^-  ':^|LTllT< -}TllllllTTTTTTTTTTTTTTTTluXz*`h
 * 3 :yGVlllTTTTTTlx-  `*}TllTTTTl< -}TlTTlTTTTTTTTTTTTTTTTTllcsV=`0
 * B_.vWzulTTlTTTTl=   >lTTlTTTTTl< -}TlTTTTTTTTTTTTTTTTTTTTllyhx_^$
 * $e :VGylTllTTTTT*   ,}llTllllll< -}llllllllllllTllTlllTTTlVeu='R$
 * $$r`>I3cllTTTTTl}~`  -*iTllllll< -}TlllTTlllTlTY}TllTTllluIw*'T$$
 * $$B!`*eKVllTTlTTllx=.  `-:~^*)|! .vvv\(r*^~!:_.`)lllTlllcIk).r#$$
 * $$$Q!`^I3yulTllTllllTx*~:_.```       ````.-_:=^r}TTllllVUwr.r#$$$
 * $$$$#Y`"L3UclTTlTTTTlTllTT}Tlll> -}TlllllTTlTTTlllTllujIL!-h$$$$$
 * $$$$$$Z,.^y3jullllllllTlx-:TTul~ -TlllllllllTTlTlllukhV*-=$$$$$$$
 * $$$$$$$#T._rkKwuullllTTlY.`xll}_ :lllTTTTllTTlllluyIy),,o#$$$$$$$
 * $$$$$$$$$QL--?wKUyullTllT~ '==- `(TlTTTTTTTlTluyjIyv_"y#$$$$$$$$$
 * $$$$$$$$$$$$d~',*lXehkVulT~-``.!xlTlllTlluVwoXzTr:-*0$$$$$$$$$$$$
 * $$$$$$$$$$$$$$Qy<-_=?TkIUUXkVcVVVVVyykoIXjyT|~__rsB$$$$$$$$$$$$$$
 * $$$$$$$$$$$$$$$$$#bu*"-_!<?x}TucccuT}x|^!,_!)y9#$$$$$$$$$$$$$$$$$
 * $$$$$$$$$$$$$$$$$$$$$$B6mcv*>=!:::!=<rxVPEB$$$$$$$$$$$$$$$$$$$$$$
 *
 ********************************************************************
 */

interface IERC20 {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function transfer(address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

contract Context {
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint;

    mapping (address => uint) private _balances;

    mapping (address => mapping (address => uint)) private _allowances;

    uint private _totalSupply;
    function totalSupply() public view returns (uint) {
        return _totalSupply;
    }
    function balanceOf(address account) public view returns (uint) {
        return _balances[account];
    }
    function transfer(address recipient, uint amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view returns (uint) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function increaseAllowance(address spender, uint addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function _transfer(address sender, address recipient, uint amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    function _mint(address account, uint amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    function _burn(address account, uint amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    function _approve(address owner, address spender, uint amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

library SafeMath {
    function add(uint a, uint b) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint a, uint b) internal pure returns (uint) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        require(b <= a, errorMessage);
        uint c = a - b;

        return c;
    }
    function mul(uint a, uint b) internal pure returns (uint) {
        if (a == 0) {
            return 0;
        }

        uint c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }
    function div(uint a, uint b) internal pure returns (uint) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint c = a / b;

        return c;
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

library SafeERC20 {
    using SafeMath for uint;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract efinance is ERC20, ERC20Detailed {
  using SafeERC20 for IERC20;
  using Address for address;
  using SafeMath for uint;
  
  
  address public governance;
  mapping (address => bool) public minters;

  constructor () public ERC20Detailed("e-finance.io", "EFI", 18) {
      governance = tx.origin;
  }

  function mint(address account, uint256 amount) public {
      require(minters[msg.sender], "!minter");
      _mint(account, amount);
  }
  
  function setGovernance(address _governance) public {
      require(msg.sender == governance, "!governance");
      governance = _governance;
  }
  
  function addMinter(address _minter) public {
      require(msg.sender == governance, "!governance");
      minters[_minter] = true;
  }
  
  function removeMinter(address _minter) public {
      require(msg.sender == governance, "!governance");
      minters[_minter] = false;
  }
}