Refactor CMakeLists

Closes #2471
Closes #1816

test/example/CMakeLists.txt

@@ -1,5 +1,6 @@
 #
 # Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+# Copyright (c) 2024 Mohammad Nejati
 #
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -7,4 +8,4 @@
 # Official repository: https://github.com/boostorg/beast
 #
 
-add_subdirectory (common)
+add_subdirectory(common)