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Introduction
I have used Swift for windows 1.9 for debugging purpose. But you can use any Swift programming language compiler as per your availability.
import Foundation func new_string(_ str: String) -> String { var result = "" var last_two_index = str.endIndex for _ in 0..<2 { last_two_index = str.index(before: last_two_index) } let last_2_chars = str.substring(from: last_two_index) for _ in 0..<2 { result.append(last_2_chars) } return result } print(new_string("tech")) print(new_string("study"))