Debouncing and form validation improvements

Extensions/String+Format.swift

@@ -0,0 +1,11 @@
+import Foundation
+
+extension String {
+    var serializationSafe: String {
+        let serializationUnsafe = ":;"
+        let forbidden = CharacterSet(charactersIn: serializationUnsafe)
+        let result = unicodeScalars.filter { !forbidden.contains($0) }
+
+        return String(String.UnicodeScalarView(result))
+    }
+}