import t
import stdio
import stdlib
import memhub
from g4node import G4Node, new_g4node


# ============================================================
# caller3: 第三个导入 G4Node 的模块
#
# 进一步增加跨模块引用，模拟 TransPyV 30+ 模块环境
# ============================================================


def caller3_find_tail(head: G4Node | t.CPtr) -> G4Node | t.CPtr:
    """找到链表尾部节点，直接访问 Next"""
    if head is None:
        return None
    cur: G4Node | t.CPtr = head
    while cur.Next is not None:
        cur = cur.Next
    return cur


def caller3_append(head: G4Node | t.CPtr, new_node: G4Node | t.CPtr) -> G4Node | t.CPtr:
    """在链表末尾追加节点"""
    if head is None:
        return new_node
    tail: G4Node | t.CPtr = caller3_find_tail(head)
    tail.Next = new_node
    return head