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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.
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- 'z' becomes 'm' and 'Z' becomes 'M'. Case remains unaffected.
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- The output will be followed by a newline (`'\n'`).
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- If the number of arguments is different from 1, the program displays a newline (`'\n'`).
### Usage
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test "abc"
nop
student@ubuntu:~/[[ROOT]]/test$ ./test "hello there"
uryyb gurer
student@ubuntu:~/[[ROOT]]/test$ ./test "HELLO, HELP"
URYYB, URYC
student@ubuntu:~/[[ROOT]]/test$ ./test
student@ubuntu:~/[[ROOT]]/test$
```