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add(subject):print-middle
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## print-middle
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### Instructions
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Write a program that prints the middle argument of the command line.
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- If the number of arguments is less than 1, print (`'\n'`)
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- If the number of arguments is **even**, print the middle two arguments with a space (`' '`) between the arguments
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- If the number of arguments is **odd**, print the middle one.
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- Print (`'\n'`) at the end of the output.
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### Usage
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```console
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$ go run . | cat -e
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$
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$ go run . "Hello World!" | cat -e
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Hello World!$
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$ go run . "Hello World!" "World!" "All" | cat -e
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World!$
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$ go run . 1 2 3 4 | cat -e
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2 3$
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```
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