player = entity_get("player")

int lua_entity_get(lua_State *L) {

    string _arg = lua_tostring(L, -1); // "player" in this example

    Entity *_entity = entityManager->GetEntity(_arg);

    CreateEntityTable(_entity); // Push the table with fields from _entity for the return value

    return 1; // One return value - the table created above
}