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## rostring
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### Instructions
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Write a program that takes a `string` and displays this `string` after rotating it
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one word to the left.
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Thus, the first word becomes the last, and others stay in the same order.
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A word is a sequence of **alphanumerical** characters.
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Words will be separated by only one space in the output.
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If the number of arguments is different from 1, the program displays a newline.
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### Usage
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```console
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student@ubuntu:~/rostring$ go build
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student@ubuntu:~/rostring$ ./rostring "abc " | cat -e
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abc$
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student@ubuntu:~/rostring$ ./rostring "Let there be light"
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there be light Let
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student@ubuntu:~/rostring$ ./rostring " AkjhZ zLKIJz , 23y"
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zLKIJz , 23y AkjhZ
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student@ubuntu:~/rostring$ ./rostring | cat -e
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$
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student@ubuntu:~/rostring$
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```
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