我想根据员工的名字打印出负责人的名字

# 定义一个字典，存储员工及其对应的负责人
employee_to_manager = {
    "Alice": "Bob",
    "Bob": "Charlie",
    "Charlie": "David",
    "David": "Eve",
    "Eve": "Frank"
}

def get_manager(employee_name):
    """
    根据员工的名字返回负责人的名字
    :param employee_name: 员工的名字
    :return: 负责人的名字，如果员工不存在则返回None
    """
    return employee_to_manager.get(employee_name, None)

# 示例使用
employee_name = "Alice"
manager_name = get_manager(employee_name)
if manager_name:
    print(f"The manager of {employee_name} is {manager_name}.")
else:
    print(f"No manager found for {employee_name}.")

def update_employee_manager(employee_name, new_manager_name):
    """
    更新员工的负责人
    :param employee_name: 员工的名字
    :param new_manager_name: 新的负责人的名字
    """
    employee_to_manager[employee_name] = new_manager_name

# 示例更新
update_employee_manager("Alice", "Grace")