I could send you the working flow that shows the temperature derived from a sensor connected to the arduino.
It gets it and displays it. I am not sure on the actual way it does it, but I am 99% sure I don't need to bit bash the numbers to the display.
I just give the temperature to a variable and call the routine to display it.
But it is an abortion of code.........
And I won't bother sending all the includes etc.
Just so you can see how it gets to display a multi-digit number.