如何在整数列表中分离多位整数

def separate_multidigit_integers(integer_list):
    result_list = []
    for num in integer_list:
        while num > 0:
            digit = num % 10
            result_list.append(digit)
            num = num // 10
    return result_list

def separate_multidigit_integers(integer_list):
    result_list = []
    for num in integer_list:
        num_str = str(num)
        for char in num_str:
            if char.isdigit():
                result_list.append(int(char))
            elif char == '-' and num < 0:
                result_list.append(int(char))
    return result_list