Error in Xcode 12.5.1: Unterminated string literal

I am creating an application that will count how many times the user has clicked on a button. I wrote the code, but it gives me an error: Unterminated string literal

I do not know what to do, I have already tried to fix it, but all attempts were in vain. Help me please.

Please show the whole source code where the error occurs.

Error in Xcode 12.5.1: Unterminated string literal
 
 
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