Blockchain 这个合同怎么称呼？

我需要一些帮助，我想在智能合约中转移eth余额。由于分发已完成且没有令牌，因此eth已堆叠在那里，但仍有人继续将eth发送到smart contract。我们想退还eth，但我们需要先收回资金。请帮助我们！我们对智能合约中的函数调用不太熟悉。下面是代码：

pragma solidity ^0.4.24;
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) {
    uint256 c = a / b;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;
  }
}
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract BasicToken is ERC20 {
  using SafeMath for uint256;
  mapping(address => uint256) balances;
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }
}
contract ERC20Standard is BasicToken {
  mapping (address => mapping (address => uint256)) internal allowed;
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }
  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }
}
contract FUNTOKEN is ERC20Standard {
    string public constant name = "FUNTOKEN";
    string public constant symbol = "FUN";
    uint8 public constant decimals = 18;
    uint256 public constant maxSupply = 100000000 * (10 ** uint256(decimals));
    uint256 public FUNToEth;
    uint256 public ethInWei;    
    address public devWallet;
    function FUNTOKEN () public {
        totalSupply = maxSupply;
        balances[msg.sender] = maxSupply;
        FUNToEth = 10000000;
        devWallet = msg.sender;
      }
    function() payable{
        ethInWei = ethInWei + msg.value;
        uint256 amount = msg.value * FUNToEth;
        if (balances[devWallet] < amount) {return;}//require
        balances[devWallet] = balances[devWallet] - amount;
        balances[msg.sender] = balances[msg.sender] + amount;
        Transfer(devWallet, msg.sender, amount);
        devWallet.send(msg.value);
    }
  }

pragma-solidity^0.4.24；
图书馆安全数学{
函数mul（uint256 a，uint256 b）内部纯返回（uint256）{
如果（a==0）{返回0；}
uint256 c=a*b；断言（c/a==b）；返回c；
}
函数div（uint256 a，uint256 b）内部纯返回（uint256）{
uint256 c=a/b，返回c；
}
函数子（uint256 a，uint256 b）内部纯返回（uint256）{
断言（b=a）；返回c；
}
}
合同ERC20Basic{
uint256公共总供给；
（地址）公众视图返回的功能平衡（uint256）；
函数传输（地址到，uint256值）公共返回（bool）；
事件传输（地址索引自，地址索引至，uint256值）；
}
合同ERC20是ERC20Basic{
功能允许（地址所有者、地址使用者）公共视图返回（uint256）；
函数transferFrom（地址from，地址to，uint256值）公共返回（bool）；
功能批准（地址支出者，uint256值）公共退货（bool）；
事件批准（地址索引所有者、地址索引支出者、uint256值）；
}
合同基本条款是ERC20{
对uint256使用SafeMath；
映射（地址=>uint256）余额；
函数传输（地址到，uint256值）公共返回（bool）{
要求（_to！=地址（0））；
需要（_值映射（地址=>uint256））内部允许；
函数transferFrom（地址from，地址to，uint256 value）公共返回（bool）{
要求（_to！=地址（0））；
要求（_值似乎只有一个地方从本合同中发送乙醚：

devWallet.send(msg.value);

这是匿名回退函数的最后一行

不幸的是，如果有人试图购买比可用代币更多的代币，该功能会提前返回，因此在没有代币的情况下发送的任何以太将永久锁定在此合同中。
如果我创建另一个合同来退款那些错误发送eth的人，您可以教我如何调用该功能来分发所有持有人吗ase sirI不知道你在问什么。合同中锁定的以太将永远锁定。