def display_stars(count)
  puts "* "*count
end

def display_growing_stars(times)
  [*1..times].each { |t| display_stars(t) }
end

irb(main):001:0> display_growing_stars(5)
*
* *
* * *
* * * *
* * * * *
=> [1, 2, 3, 4, 5]