How to add slashes between the chars of a string in Kotlin? - string

Question

I am doing an activity to learn Kotlin where I am completely stuck. I am new to coding and Kotlin so excuse me for my mistakes and lack of knowledge.
This is the description of the activity:
You need to write a program that prints date and time in a special format. Hours, minutes and seconds are split by a colon, and day, month and year are split by a slash. For example:
Sample Input 1:
23 59 59
12 12 2018
Sample Output 1:
23:59:59 12/12/2018
I have been trying a lot of different things, but I'm lost. This is the path that I was trying to take:
fun main() {
val time = readLine()?.split("")
val date = readLine()?.split("")
println("$time $date")
}
I know the code is wrong, as I don't know how to do it, I am simply posting the path or idea that I was following. If someone could explain me what I have to do, I would really appreciate it. Thanks!

Answer 1

Try to edit your code like this
fun main() {
val time = readLine()?.split(" ")?.joinToString(":") ?: ""
val date = readLine()?.split(" ")?.joinToString("/") ?: ""
println("$time $date")
}

Answer 2

If you'd like to check if the read line is actually a date you can use DateTimeFormatter
private fun parseDate(arg: String) {
try {
val timeString = arg.split(" ").take(3).joinToString(":")
val dateString = arg.split(" ").takeLast(3).joinToString("/")
val parser = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm:ss")
parser.parse("$dateString $timeString")
println("$dateString $timeString")
} catch (e: Exception) {
println("[ERR] - Error parsing argument: $arg")
}
}
fun main() {
parseDate(readLine())
}