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## swap-name
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### Instructions
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Write a program that takes a first and last name as one argument and swaps them.
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- If there is more than one argument, nothing should be printed.
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- The argument should contain only alphabetic characters and spaces and only two words, if not, you have to print `"Error\n"`
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- The result must be followed with a new line at the end (`'\n'`).
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- Trim any extra space in the beginning or end of the string.
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### Usage
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```console
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$ go run . | cat -e
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$ go run . "James Carl" "Peter Lab" | cat -e
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$ go run . "ROB carlos" | cat -e
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carlos ROB$
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$ go run . "He2 $%hello" | cat -e
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Error$
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$ go run . " JULIE BIRD " | cat -e
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BIRD JULIE$
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$ go run . "Carl Jon Mic" | cat -e
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Error$
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$ go run . "ROB" | cat -e
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Error$
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```
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