creating a ruby file to work more on functions and files interaction
defining functions and make use of them by calling them in various ways
adding more blank lines to make it more clean readable
removing unnecessary blank line
removing function rewind and rewriting it again
adding a statement before printing the three lines
creating ex21.rb to work with functions that returns something
defining the functions and declaring variables that calls the defined functions
printing the results from the called functions
adding a puzzle and printing the result form that complex puzzzle
adding a blank line to make the output more readable