Add println() inside PrintingTextChangedListener in Observer pattern otherwise we don't get any output

[MirzalievPulat]

`class PrintingTextChangedListener : TextChangedListener {

private var text = ""

override fun onTextChanged(oldText: String, newText: String) {
    text = "Text is changed: $oldText -> $newText"
    println(text) // here 
}

}`