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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 not 1, the program displays a newline(`'\n'`).
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### Usage
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```console
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student@ubuntu:~/piscine/test$ go build
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student@ubuntu:~/piscine/test$ ./test "abc"
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nop
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student@ubuntu:~/piscine/test$ ./test "hello there"
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uryyb gurer
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student@ubuntu:~/piscine/test$ ./test
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student@ubuntu:~/piscine/test$
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```
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