Chengshengyang Task

文件末尾需要换行（确切说是每一行结尾都需要换行）

>  [why-should-files-end-with-a-newline](http://stackoverflow.com/questions/729692/why-should-files-end-with-a-newline)

> [What is the rationale for this warning](https://gcc.gnu.org/ml/gcc/2001-07/msg01120.html)