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## rot13
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### Instructions
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Write a program that takes a `string` and displays it, replacing each of its
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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'`).
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### Usage
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```console
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student@ubuntu:~/piscine-go/test$ go build
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student@ubuntu:~/piscine-go/test$ ./test "abc"
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nop
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student@ubuntu:~/piscine-go/test$ ./test "hello there"
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uryyb gurer
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student@ubuntu:~/piscine-go/test$ ./test "HELLO, HELP"
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URYYB, URYC
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student@ubuntu:~/piscine-go/test$ ./test
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student@ubuntu:~/piscine-go/test$
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```
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