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## lastword
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### Instructions
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Write a program that takes a `string` and displays its last word, followed by a newline (`'\n'`).
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- A word is a section of `string` delimited by spaces or by the start/end of the `string`.
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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, or if there are no word, the program displays nothing.
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### Usage
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```console
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student@ubuntu:~/lastword$ go build
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student@ubuntu:~/lastword$ ./lastword "FOR PONY" | cat -e
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PONY$
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student@ubuntu:~/lastword$ ./lastword "this ... is sparta, then again, maybe not" | cat -e
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not$
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student@ubuntu:~/lastword$ ./lastword " "
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student@ubuntu:~/lastword$ ./lastword "a" "b"
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student@ubuntu:~/lastword$ ./lastword " lorem,ipsum " | cat -e
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lorem,ipsum$
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student@ubuntu:~/lastword$
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```
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