added a way to show the call stack of the functions

src/utils/tracer.hpp

@@ -0,0 +1,22 @@
+
+#include <iostream>
+#include <string>
+
+namespace {
+    struct FunctionTracer {
+        std::string name;
+        inline static int tab_counter = 0;
+
+        FunctionTracer(const std::string& func): name(func) {
+            std::cout << std::string(tab_counter++, '\t') << "BEGIN " << name
+                      << std::endl;
+        }
+
+        ~FunctionTracer() {
+            std::cout << std::string(--tab_counter, '\t') << "Exiting " << name
+                      << std::endl;
+        }
+    };
+} // namespace
+
+#define TRACE_FUNCTION FunctionTracer tracer(__FUNCTION__);