// File: Bowman.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./SafeMath.sol";
import "./Ownable.sol";

contract Bowman is Ownable {
    using SafeMath for uint256;

    uint256 constant UINT256_MAX = ~uint256(0);

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor() Ownable(msg.sender) {
        _name = "Bowman";
        _symbol = "BOW";
        _decimals = 18;

        _totalSupply = 100000 * 1e18;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    function name() external view returns (string memory) {
        return _name;
    }

    function symbol() external view returns (string memory) {
        return _symbol;
    }

    function decimals() external view returns (uint8) {
        return _decimals;
    }

    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender) external view returns (uint256) {
        return _allowances[owner][spender];
    }

    function transfer(address recipient, uint256 amount) external returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
        _transfer(sender, recipient, amount);
        if (_allowances[msg.sender][sender] != UINT256_MAX) {
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        }
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0));
        require(recipient != address(0));

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0));
        require(spender != address(0));

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function burn(uint256 amount) external returns (bool) {
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(msg.sender, address(0), amount);
        return true;
    }
}

// File: IOwnershipTransferrable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface IOwnershipTransferrable {
  function transferOwnership(address owner) external;
  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./IOwnershipTransferrable.sol";

abstract contract Ownable is IOwnershipTransferrable {
  address private _owner;

  constructor(address owner) {
    _owner = owner;
    emit OwnershipTransferred(address(0), _owner);
  }

  function owner() public view returns (address) {
    return _owner;
  }

  modifier onlyOwner() {
    require(_owner == msg.sender, "Ownable: caller is not the owner");
    _;
  }

  function transferOwnership(address newOwner) override external onlyOwner {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

// File: SafeMath.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

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

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

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

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0);
    uint256 c = a / b;
    return c;
  }

  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}