toSingleLineStringForDisplay in Kotlin v2

toSingleLineStringForDisplayV2.kt

fun toSingleLineStringForDisplay() = buildString {
  append(street1).append(", ")
  street2?.let { append(it).append(", ") }
  street3?.let { append(it).append(", ") }
  street4?.let { append(it).append(", ") }
  append(city).append(", ")
  append(state).append(" ")
  append(postalCode)
}