Combine object data value into single string in kotlin - kotlin

Question

Hey I have object of Event. I want to combine all property value into single string. I did this without any problem. I want to know is there any better way to optimise this code in memory, efficiency etc.
SingleEventString.kt
fun main() {
var newString: String? = null
val eventList = createData()
eventList.forEachIndexed { index, event ->
val title = event.title
val status = event.status
if (!title.isNullOrEmpty()) {
newString = if(index == 0){
"$title"
}else{
"$newString $title"
}
}
if (!status.isNullOrEmpty()) {
newString = "$newString $status"
}
}
println(newString)
}
data class Event(val title: String? = null, val status: String? = null)
fun createData() = listOf(
Event("text 1", "abc"),
Event("text 2", "abc"),
Event("text 3", "abc"),
Event("text 4", "abc"),
Event("", "abc"),
Event(null, "abc")
)

Answer 1

data class Event(val title: String? = null, val status: String? = null)
fun createData() = listOf(
Event("text 1", "abc"),
Event("text 2", "abc"),
Event("text 3", "abc"),
Event("text 4", "abc"),
Event("", "abc"),
Event(null, "abc")
)
val newString = createData()
.joinToString(" ") { "${it.title?: ""} ${it.status?: ""}".trim() }
println(newString)