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User writes a value, logic processes it and erases the value

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This is a no brainer, but here is what I am trying to do:

when the user enters a comment in the comment string and presses Enter, I want to log that comment in an excel spreadsheet and erase it (empty string) after that line.

I am struggling with the part about entering the comment and erasing it. If the user presses enter while the execution is inside the case structure, the comment gets erased.

Any idea on how I can resolve this?

 

 

 


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