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## switchcase
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### Instructions
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Write a program that takes a `string` and reverses the case of all its letters.
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- Other characters remain unchanged.
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- The result must be followed by a newline (`'\n'`).
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- If the number of arguments is different from 1, the program displays a newline (`'\n'`).
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### Usage
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test "SometHingS iS WronG"
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sOMEThINGs Is wRONg
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student@ubuntu:~/[[ROOT]]/test$ ./test
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student@ubuntu:~/[[ROOT]]/test$
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```
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