having a issue with new var “difference”
“let message = “The value of the slider is: (currentValue)” +
“\nThe target value is: (targetValue)” +
"\nThe difference is: (difference)”
Excerpt From: By Fahim Farook. “iOS Apprentice.” Apple Books. 
In the actual code, all the quote marks are the right kind, straight up and down, except for the last one, which is a slanty one. This happens more often these days when pasting code, as the fancy slanty ones show up a lot in formatted pages.
Just remove that ” at the end of difference)”, and replace it with a ".
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