better record tracker

src/RecordTracker.cpp

@@ -12,15 +12,14 @@ void RecordTracker::OnWallCrashed(WallCrashEvent *event) {
 
 void RecordTracker::checkJumpRecord() const {
 	const uint64_t newRecord = jumped;
-	FileManager::instance->readFile("record_jump.txt", [newRecord](const std::string& content){
-		if (content.empty()){
-			FileManager::instance->writeFile("record_jump.txt", std::to_string(newRecord));
-			return;
-		}
+	FileManager::instance->readFile("record_jump.txt", [newRecord](std::string content){
+		if (content.empty())
+			content = "0";
 		uint64_t oldRecord = std::stoull(content);
 		if (newRecord > oldRecord){
-			std::cout << "New jump record!" << std::endl;
+			std::cout << "New jump record: " << newRecord << std::endl;
 			FileManager::instance->writeFile("record_jump.txt", std::to_string(newRecord));
+			return;
 		}
 	});
 }