一个简单的类似于点菜系统的汽车服务系统程序。
1、给定一系列的服务以及对应的价格
2、选择你所需要的服务
3、若输入‘1’则退出并且计算出总价
4、若输入的是某一项服务则继续输入，直至输入的是‘1’(Edit your original Automobile Service Invoice to use functions.
The function should allow a user to enter as many services that they want done to their cars.
The program should validate all date entered, and allow for upper and lower case spellings of services.
When the user types in a 1 that will terminate the program, and print the total amount due.)