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## switchcase
### Instructions
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'`).
### Usage
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test "SometHingS iS WronG"
sOMEThINGs Is wRONg
student@ubuntu:~/[[ROOT]]/test$ ./test
student@ubuntu:~/[[ROOT]]/test$
```