如何创建一个可重复生成的自定义require函数

我在Lua中创建了我的自定义require函数，但当我多次创建该函数时，它似乎无法替换先前创建的require函数。

我希望能够随时替换（或覆盖）以前的require函数。

我的代码:

#include "lua.hpp"

int main()
{
    lua_State *L = luaL_newstate();
    luaL_openlibs(L);
    luaopen_my(L);
    lua_settop(L, 0);
    for (int i = 0; i < 2; ++i)
    {
        luaL_dostring(L, "local require_original = require\n"
                         "function require(name, ...)\n"
                             "print('Hello World')\n"
                             "local val = table.pack(require_original(name, ...))\n"
                             "return table.unpack(val,1,val.n)\n"
                         "end\n");
        luaL_dostring(L, "package.preload['A'] = function()\n"
                             "local a = {}\n"
                             "print('A required')\n"
                             "return a\n"
                         "end\n");
        luaL_dostring(L, "local a = require 'A'");
        luaL_dostring(L, "package.preload['A'] = nil package.loaded['A'] = nil");
    }
    lua_close(L);
}

我得到的结果 :

Hello World
A required
Hello World
Hello World
A required

我期望的结果 :

Hello World
A required
Hello World
A required

我应该更改什么以获得我期望的结果？