Write a Scala program to create a new string from a given string swapping the last two characters of the given string. The length of the given string must be two or more

object Scala_String {
  def lastTwo(str1: String): String = {
    if (str1.length() < 2) return str1;
    return str1.substring(0, str1.length - 2) + str1.charAt(str1.length - 1) + str1
      .charAt(str1.length - 2);
  }
  def main(args: Array[String]): Unit = {
    var str1 = "String";
    println("The given strings is: " + str1);
    println("The string after swap last two characters are: " + lastTwo(str1));
    str1 = "Scala";
    println("The given strings is: " + str1);
    println("The string after swap last two characters are: " + lastTwo(str1));
  }
}