(训)报告需求:有一份账单文件,记录了消费收入的具体记录,内容如下:name,date,money,type,remarks周杰轮,2022-01-01,100000,消费,正式周杰轮,2022-01-02,300000,收入,正式周杰轮,2022-01-03,100000,消费,测试林俊节,2022-01-01,300000,收入,正式林俊节,2022-01-02,100000,消费,测试林俊节,2022-01-03,100000,消费,正式林俊节,2022-01-04,100000,消费,测试林俊节,2022-01-05,500000,收入,正式张学油,2022-01-01,100000,消费,正式张学油,2022-01-02,500000,收入,正式张学油,2022-01-03,900000,收入,测试王力鸿,2022-01-01,500000,消费,正式王力鸿,2022-01-02,300000,消费,测试王力鸿,2022-01-03,950000,收入,正式刘德滑,2022-01-01,300000,消费,测试刘德滑,2022-01-02,100000,消费,正式刘德滑,2022-01-03,300000,消费,正式将内容复制并保存为 bill.txt文件读取文件将文件写出到bill.txt.bak文件作为备份同时,将文件内标记为测试的数据行丢弃