title: Error reading character of string - visual studio 2017
body: <p>I'm trying to use the strtok function, which shows results as program targets, but when I set the breakpoints I get an error reading "character reading character of string ..." as in the image. Please explain to me why the error occurred and how to fix 
  <img src="https://i.stack.imgur.com/z6AIi.png" alt="enter image description here">
  Thank you very much
  here, all my code</p>