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fix : delete `!` in usage part and rewrite the description
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## swap-args
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### Instructions
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Write a program that takes two arguments and swaps them
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- If the arguments are not 2 print (`'\n'`).
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- Separate the arguments with (`' '`)
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- Print (`'\n'`) at the end of the output.
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Write a program that takes two arguments and swaps them.
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- If the number of arguments is different from 2, print (`'\n'`).
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- The arguments must be separated by a withe space.
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- Print (`'\n'`) at the end of the program.
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### Usage
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$ go run . 1 2 | cat -e
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2 1$
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$ go run . "World" "Hello" | cat -e
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Hello! World$
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Hello World$
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```
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