refactored transformation: added folders for each transformation

src/GraphCall/graph_calls.cpp

@@ -1,4 +1,4 @@
-#include "../Utils/leak_detector.h"
+#include "leak_detector.h"
 
 #include <cstdio>
 #include <cstdlib>
@@ -21,7 +21,7 @@
 #include "../Utils/json.hpp"
 #include "../ParallelizationRegions/ParRegions_func.h"
 #include "../DynamicAnalysis/gCov_parser_func.h"
-#include "../ExpressionTransform/expr_transform.h"
+#include "expr_transform.h"
 #include "../LoopAnalyzer/loop_analyzer.h"
 #include "../VerificationCode/verifications.h"