improved code

Signed-off-by: Marino Faggiana <marino@marinofaggiana.com>

iOSClient/Extensions/String+Extensions.swift

@@ -23,7 +23,7 @@
 
 import Foundation
 import UIKit
-import CommonCrypto
+import CryptoKit
 
 extension String {
 
@@ -50,6 +50,14 @@ extension String {
         return String(format: "%02d:%02d:%02d", hour, min, sec)
     }
 
+    func md5() -> String {
+        let digest = Insecure.MD5.hash(data: self.data(using: .utf8) ?? Data())
+        return digest.map {
+            String(format: "%02hhx", $0)
+        }.joined()
+    }
+
+    /* DEPRECATED iOS 13
     func md5() -> String {
         // https://stackoverflow.com/a/32166735/9506784
 
@@ -69,6 +77,7 @@ extension String {
 
         return digestData.map { String(format: "%02hhx", $0) }.joined()
     }
+    */
 
     var urlEncoded: String? {
         // +        for historical reason, most web servers treat + as a replacement of whitespace