Arduino Error Expected unqualified-id before 're-interpret_cast'

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4 
 if(myChar == '1')
    {
      1();
    }

That's pretty unlikely code.
"1" cannot be a function name.

So, where is the definition of a function called "1"?

Also, "mychar" is not the same as "myChar".

Do you see now why we ask you to post ALL your code?

void F()

That's problematical too.

I think all those "Translated " strings will be a problem with limited RAM processors.