Add copyright header

src/phonenumberutil/mod.rs

@@ -1,3 +1,18 @@
+// Copyright (C) 2009 The Libphonenumber Authors
+// Copyright (C) 2025 The Kashin Vladislav (Rust adaptation author)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 mod helper_constants;
 mod helper_functions;
 pub mod errors;
@@ -5,7 +20,6 @@ pub mod enums;
 pub mod phonenumberutil;
 mod phone_number_regexps_and_mappings;
 pub(self) mod helper_types;
-pub(self) mod comparisons;
 
 use std::sync::LazyLock;