contract BurnableToken is StandardToken, Ownable {

  event Burn(address indexed burner, uint256 value);

  /**
    * @dev Burns a specific amount of tokens.
    * @param _value The amount of token to be burned.
    */
  function burn(uint256 _value) public onlyOwner {
    require(_value <= balances[msg.sender], "Not enough balance to burn");
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    balances[msg.sender] = balances[msg.sender].sub(_value);
    totalSupply = totalSupply.sub(_value);
    emit Burn(msg.sender, _value);
  }

}
/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
function burn(uint256 _value) public onlyOwner {
  require(_value <= balances[msg.sender], "Not enough balance to burn");
  // no need to require value <= totalSupply, since that would imply the
  // sender's balance is greater than the totalSupply, which *should* be an assertion failure

  balances[msg.sender] = balances[msg.sender].sub(_value);
  totalSupply = totalSupply.sub(_value);
  emit Burn(msg.sender, _value);
}

/**
 * @dev Burns a specific amount of tokens.
 * @param _value The amount of token to be burned.
 */