实现任意长整数的加法操作，输入为含有逗号的整数形式-To achieve any long-integer addition operation, the input is an integer that contains the form of a comma

从一串字符串中提取逗号隔开的字符片段，从而可以提取需要的数据等内容。-get data from a string by using a function named strtok to cut a long string.