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## swap-name
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### Instructions
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Write a program that takes two words in the first argument and swaps them.
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- If the number of arguments is not 2, nothing should be printed.
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- The first argument should contain only alphabetic characters and spaces and only two word, if not, print `"Error\n"`
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- Print the result with a new line at the end (`'\n'`).
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- Trim space in the beginning and 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 . "Hello World" "Hello World" | cat -e
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$ go run . "Hello World" | cat -e
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World Hello$
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$ go run . "He2 $%hello" | cat -e
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Error$
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$ go run . " Hello World " | cat -e
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World Hello$
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$ go run . "Hello World Hello" | cat -e
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Error$
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$ go run . "Hello" | cat -e
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Error$
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```
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