title: Read a line and push into a line-stack until the end of file
body: <p>I have to do a program and unfortunately I have no idea where to start. It's like we were doing very basic coding and then my teacher went on maternity leave and our substitute thinks we are further along then we actually are. I know how to ready from a file, but I do not know how to put the line into a stack from there.
  These are the instructions 
  1) Read a line and push into a line-stack until the end of file 2) While line_stack is not empty a. Pop one element out and process the following i. Split elements in this line (i.e. numbers) using StringTokenzier ii. Push all numbers into number-stack iii. While number_stack is not empty 1. Pop a number 2. Print a character using that ascii number </p>