studen.rb

require_relative "wagon_sort"

def prompt
  gets.chomp
end

def add_students(student, array)
  array.push(student)
end

def menu
  array = []
  input = nil
  until input == ""
    puts "type a student name :> "
    input = prompt
    puts add_students(input, array)
  end

  array = wagon_sort(array)
  puts "Congratulations! Your Wagon has #{array.length} students:"
  print "- "

  print "#{array[0]}"
  array[1..-2].each do |x|
    print "#{x}, "
  end
  print "#{array[-2]} and  #{array[-1]}"
end

menu