val animals = listOf("Lion", "Penguin", "Giraffe", "Whale", "Shark")

val usernames = animals.map { animalAsBase ->
    val randomNumber = Random.nextInt(0, 10)
    val randomCharacter = listOf("!", "@", "$", "%", "#")[Random.nextInt(0, 5)]
    "$animalAsBase$randomCharacter$randomNumber"
}