Move to C++ coding style, cleanup current code (#18)

Used CLion to unify our current code

src/logger.cpp

@@ -1,19 +1,4 @@
-/*
-// Copyright (c) 2019 Onur Dundar
-//
-// 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.
-*/
-
+#include <iostream>
 #include "logger.h"
 
 static Logger *loggerInstance = nullptr;