extension
Returns the extension of this path (not including the dot), or an empty string if it doesn't have one.
val Path.extension: String(source)
import java.nio.file.Paths
import kotlin.io.path.extension
fun main() {
val file = Paths.get("example.txt")
println(file.extension) // prints: txt
val hidden = Paths.get(".env")
println(hidden.extension) // prints: (empty string)
val archive = Paths.get("archive.tar.gz")
println(archive.extension) // prints: gz
}