build: Fix CMake and ns3 script bugs, add a test suite and fix formatting

src/csma-layout/CMakeLists.txt

@@ -4,8 +4,12 @@ set(source_files model/csma-star-helper.cc)
 
 set(header_files model/csma-star-helper.h)
 
-set(libraries_to_link ${libnetwork} ${libinternet} ${libcsma} ${libpoint-to-point})
+set(libraries_to_link ${libnetwork} ${libinternet} ${libcsma}
+                      ${libpoint-to-point}
+)
 
 set(test_sources)
 
-build_lib("${name}" "${source_files}" "${header_files}" "${libraries_to_link}" "${test_sources}")
+build_lib("${name}" "${source_files}" "${header_files}" "${libraries_to_link}"
+          "${test_sources}"
+)

src/csma-layout/examples/CMakeLists.txt

@@ -1,5 +1,9 @@
 set(name csma-star)
 set(source_files ${name}.cc)
 set(header_files)
-set(libraries_to_link ${libcsma} ${libcsma-layout} ${libinternet} ${libapplications})
-build_lib_example("${name}" "${source_files}" "${header_files}" "${libraries_to_link}")
+set(libraries_to_link ${libcsma} ${libcsma-layout} ${libinternet}
+                      ${libapplications}
+)
+build_lib_example(
+  "${name}" "${source_files}" "${header_files}" "${libraries_to_link}"
+)