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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 spots ahead in alphabetical order.
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- 'z' becomes 'm' and 'Z' becomes 'M'. The case of the letter stays the same.
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- The output will be followed by a newline (`'\n'`).
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Refactor & Beautify & destruction commit
return early, remove else branches, reorder conditions and top-level functions, remove empty lines, remove unnecessary append(), fix typos, stop using testing package, remove dead code, fix mistakes in subjects, tests and solutions, remove disclaimers, reformat comments, simplify solutions, tests, add more instructions to subjects, remove obsolete files, etc.
Some of the reasons behind those modifications will be added to good-practices.en.md
Some of the exercises are now broken, they will have to be fixed, most of them have a "TODO:" comment.
4 years ago
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- If the number of arguments is different from 1, the program displays nothing.
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### Usage
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```console
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$ go run . "abc"
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nop
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$ go run . "hello there"
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uryyb gurer
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$ go run . "HELLO, HELP"
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URYYB, URYC
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$ go run .
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$
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```
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