删除字符串中的连续字符，直到没有任何连续字符为止

def remove_consecutive_chars(string):
    result = []
    i = 0
    while i < len(string):
        if i == len(string) - 1 or string[i] != string[i+1]:
            result.append(string[i])
        else:
            while i < len(string) - 1 and string[i] == string[i+1]:
                i += 1
        i += 1
    return ''.join(result)

# 示例用法
input_string = "aabbbccccdd"
output_string = remove_consecutive_chars(input_string)
print(output_string)  # 输出: "abcd"