Text help

Hey guys I am making a copy of WhatsApp I made the game identify what the key I am pressing is but I need help to allow it to form words and if space bar is pressed to actually make a space this is what I have in the mean time

init = function()
  local y = 80
for key in keyboard 
  if keyboard[key] then
    y -= 20
end
end
end

Draw = function ()
Screen.drawSprite(key, 0, 90, 40, 40)

Can you help

Text input >> https://microstudio.dev/i/fezfan/typing/

Thanks loginus