def make_drawing
      ln_arr = create_color_string.scan(/.{#{self.width}}/)
      ln_arr.each {|ln| draw_line(ln.split(""))}
    end
def make_drawing
      ln_arr = create_color_string.scan(/.{#{self.width}}/)
      ln_arr.each {|ln| draw_line(ln.split(""))}
    end
Takes in the path to the PNG file and
 the width (in 'pixels' - equivalent to two spaces)
 Calls create_color_string to get an array of colors & split it into rows
 Then iterates over that array, calling draw_line on each row