import Foundation

class BkkCrypt {
    
    func BkkCrypt(_ input: String) -> String {
        return input
    }
}

extension String {
    func BKKCrypt() -> String {
        return self
    }
}

import Foundation

class BkkCrypt {
    
    func BkkCrypt(_ input: String) -> String {
        return input
    }
}

--- 
+++ 
@@ -6,3 +6,9 @@
         return input
     }
 }
+
+extension String {
+    func BKKCrypt() -> String {
+        return self
+    }
+}
Add encrypting function as a String extension
