Guessing the number game assignment HELP.

So basically, I have an assignment where I need to create a game so that arduino generates a random number and the person playing the game has to guess what the random number is. The number has to be in between 1 and 100. However, when I send a number bigger than 9 it sends it separately. I cant understand what I need to change. Thanks in advance.

chapter_4_assignment.ino (1.36 KB)

And don't post the same question in more than one forum at a time please:
https://forum.arduino.cc/index.php?topic=652114.msg4395919#msg4395919

This forum is generally where you'd pay to have a project done for you.