My 99 Bottles of Beer Lyrics in Kotlin PL. Aided with the source: http://bit.ly/2Nvjh9f

LyricsFor99BottlesOfBeer.kt

fun main(args: Array<String>) {
    printSongLyrics(99)
}

fun printSongLyrics(bottlesSize: Int) {
    if (bottlesSize < 0) {
        println("Do not enter negative values!")
        return
    }

    println("Lyrics of the song $bottlesSize Bottles of Beer\n")

    for (bottleIndex in bottlesSize downTo 0)
        printLyricsPart(bottleIndex, bottlesSize)
}

fun printLyricsPart(bottlesSize: Int, bottlesTotalSize: Int) {
    val firstLine = "${getBottleAmountText(bottlesSize)} on the wall, ${getBottleAmountText(bottlesSize)}.\n"
    if (bottlesSize >= 1) {
        println(firstLine +
                "Take one down and pass it around, ${getBottleAmountText(bottlesSize - 1)} on the wall.\n")
    } else {
        println(firstLine +
                "Go to the store and buy some more, $bottlesTotalSize bottles of beer on the wall.")
    }
}

fun getBottleAmountText(bottlesSize: Int) =
        when (bottlesSize) {
            1 -> "1 bottle"
            0 -> "no more bottles"
            else -> "$bottlesSize bottles"
        } + " of beer"