1-Old.kt

object MathUtils {
  fun add(a: Int, b: Int): Int { /* Function body */ }
  fun sub(a: Int, b: Int): Int { /* Function body */ }
}

fun main() {
  val sumResult = MathUtils.add(10, 20)
  val subResult = MathUtils.sub(30, 10)
}

2-New.kt

// On top of the file 

fun add(a: Int, b: Int): Int { /* Function body */ }
fun sub(a: Int, b: Int): Int { /* Function body */ }

fun main() {
  val sumResult = add(10, 20)
  val subResult = sub(30, 10)
}