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## switchcase
### Instructions
Write a program that takes a `string` and reverses the case of all its letters.
- Other characters remain unchanged.
- The result must be followed by a newline(`'\n'`).
- If the number of arguments is different from 1, the program displays a newline(`'\n'`).
### Usage
```console
student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test "SometHingS iS WronG"
sOMEThINGs Is wRONg
student@ubuntu:~/piscine-go/test$ ./test
student@ubuntu:~/piscine-go/test$
```