chore(core): Cleanup code p2 (#16041)

* Update AchievementMgr.cpp

* Update M2Stores.cpp

* Update LFGHandler.cpp

* Update PetHandler.cpp

* Update WaypointMovementGenerator.cpp

* Update ScriptMgr.cpp

* Update SpellAuras.cpp

* Update Spell.cpp

* Update SecretMgr.cpp

* Update SpellScript.cpp

* Update SecretMgr.cpp

* Update Spell.cpp

* Update SpellAuras.cpp

* Add files via upload

* Update PetHandler.cpp

* Update PetHandler.cpp

* Update CalendarMgr.cpp

* Update LFG.h

* Update WaypointMovementGenerator.cpp

* Update MapScripts.cpp

* Update Unit.cpp

* Update SmartScript.cpp

src/server/game/Calendar/CalendarMgr.cpp

@@ -459,7 +459,7 @@ uint32 CalendarMgr::GetPlayerNumPending(ObjectGuid guid)
 std::string CalendarEvent::BuildCalendarMailSubject(ObjectGuid remover) const
 {
     std::ostringstream strm;
-    strm << remover.ToString().c_str() << ':' << _title;
+    strm << remover.ToString() << ':' << _title;
     return strm.str();
 }