add utils class

pass/Utils.swift

@@ -0,0 +1,25 @@
+//
+//  Utils.swift
+//  pass
+//
+//  Created by Mingshen Sun on 8/2/2017.
+//  Copyright © 2017 Bob Sun. All rights reserved.
+//
+
+import Foundation
+
+class Utils {
+    static func removeFileIfExists(atPath path: String) {
+        let fm = FileManager.default
+        do {
+            if fm.fileExists(atPath: path) {
+                try fm.removeItem(atPath: path)
+            }
+        } catch {
+            print(error)
+        }
+    }
+    static func removeFileIfExists(at url: URL) {
+        removeFileIfExists(atPath: url.path)
+    }
+}