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## rot13
### Instructions
Write a program that takes a `string` and displays it, replacing each of its
letters by the letter 13 spaces ahead in alphabetical order.
- 'z' becomes 'm' and 'Z' becomes 'M'. Case remains unaffected.
- The output will be followed by a newline(`'\n'`).
- If the number of arguments is not 1, the program displays a newline(`'\n'`).
### Usage
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test "abc"
nop
student@ubuntu:~/piscine/test$ ./test "hello there"
uryyb gurer
student@ubuntu:~/piscine/test$ ./test
student@ubuntu:~/piscine/test$
```