first commit

src/StringHelper.hpp

@@ -0,0 +1,13 @@
+#pragma once
+#include <string>
+#include <cstdarg>
+
+namespace YYCC::StringHelper {
+	
+	bool Printf(std::string& strl, const char* format, ...);
+	bool VPrintf(std::string& strl, const char* format, va_list argptr);
+
+	std::string Printf(const char* format, ...);
+	std::string VPrintf(const char* format, va_list argptr);
+
+}