unexpected 'public' (T_PUBLIC)

try removing that closing: ?>

its probably the problem. if its not, then post again and someone will try to help.
what is not a problem - is you learning how to code. i salute you doing the right thing and working through the tutorial. i encourage your efforts. it is difficult and confusing at first, but it does get easier. and you will find that sometimes the issues that take the longest to solve - are just a few characters in length.