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var message = "Welcome!"
var tips = []
var total_donated = 0

fun setMessage(newMessage)
  var message = newMessage
  return null
end

fun getMessage() -> message

fun buyCoffee(note)
  var tip = ["from","amount",note,"time"]
  add(tips, tip)
  var total_donated = total_donated + 1
  return null
end

fun getTipsCount() -> len(tips)

fun getTip(i) -> tips / i