Refactor SimDatabase

utilities/include/util.hpp

@@ -170,7 +170,7 @@ namespace util
   static inline int
       generateMD5(const char *filepath,
                   char *lastHash,
-                  const std::function<void(const std::string)> &toLog)
+                  const std::function<void(const std::string)> toLog)
   {
     int file_descript;
     unsigned long file_size;
@@ -205,7 +205,7 @@ namespace util
   static inline int
       generateMD5(const char *filepath,
                   char *buffer,
-                  const std::function<void(const std::string)> &toLog)
+                  const std::function<void(const std::string)> toLog)
   {
     int file_descriptor;
     unsigned long file_size;