def team_availability(time_used_array)
  # total_time_availability = [['8:30', '9:00'],['9:00', '9:30'],['9:30', '10:00'],['10:00', '10:30'],['10:30', '11:00'],['11:00', '11:30'],['11:30', '12:00'],['1:00', '1:30'],['1:30', '2:00'],['2:00', '2:30'],['2:30', '3:00'],['3:00', '3:30'],['3:30', '4:00'],['4:00', '4:30'],['4:30', '5:00']]
  time_array = [[8.5, 9.0], [9.0, 9.5], [9.5, 10.0], [10.0, 10.5], [10.5, 11.0], [11.0, 11.5], [11.5, 12.0], [13.0, 13.5], [13.5, 14.0], [14.0, 14.5], [14.5, 15.0], [15.0, 15.5], [15.5, 16.0], [16.0, 16.5], [16.5, 17.0]]
  # time_array = []
  # (8.5..17).step(0.5).each do |time|
  #     time_array << time
  # end
  # time_slot = []
  # time_array.each_with_index do |x, i|
  #   time_slot << [x, time_array[i+1]]
  # end

  time_used_array_to_num = []

  time_used_array.each do |time|
    temp_array1 = time[0].split(":")
    num1 = temp_array1[0].to_i
    num1 += 12 if num1 < 8
    if temp_array1[1] == "30"
      num1 += 0.5
    end

    temp_array2 = time[1].split(":")
    num2 = temp_array2[0].to_i
    num2 += 12 if num2 < 8
    if temp_array2[1] == "30"
      num2 += 0.5
    end
    time_used_array_to_num << [num1, num2]
  end

  expand_time_used_array = []

  time_used_array_to_num.each do |time|
    if time[1] - time[0] == 0.5
      expand_time_used_array << time
    else
      until time[0] == time[1] do
        expand_time_used_array << [time[0], time[0]+0.5]
        time[0] += 0.5
      end
    end
  end
  x = expand_time_used_array.uniq

  available_time = []
  time_array.each do |time|
    unless x.include?(time)
      available_time << time
    end
  end
  p available_time
  availe_time_to_s = []
  available_time.each do |time|
    if time[0] % 1 == 0
      time1 = time[0].to_i.to_s + ":00"
    else
      time1 = time[0].to_i.to_s + ":30"
    end

    if time[1] % 1 == 0
      time2 = time[1].to_i.to_s + ":00"
    else
      time2 = time[1].to_i.to_s + ":30"
    end
    availe_time_to_s << [time1, time2]
  end

  availe_time_to_s
end


team_availability([['9:00', '9:30'], ['9:00', '11:30'], ['10:00', '11:00'], ['2:30', '3:00'], ['2:30', '3:30']])