diff --git a/include/common/sundry.h b/include/common/sundry.h
index b841a91..f12a2a5 100644
--- a/include/common/sundry.h
+++ b/include/common/sundry.h
@@ -4,6 +4,7 @@
 #include <stdint.h>
 
 char* show_bool(uint8_t value);
+char* string_load(const char *fmt, ...);
 char* uint32_to_string(uint32_t number);
 char* string_join(const char *base, const char *add);
 void string_list_debug(char *describe, char **string_list);
diff --git a/src/cleardns.c b/src/cleardns.c
index 3ad366a..e1f4f0e 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -115,8 +115,12 @@ void cleardns() { // cleardns service
 }
 
 int main(int argc, char *argv[]) {
-    init(argc, argv);
-    log_info("ClearDNS server start (%s)", VERSION);
-    cleardns();
+//    init(argc, argv);
+//    log_info("ClearDNS server start (%s)", VERSION);
+//    cleardns();
+
+    char *test = string_load("`%s` -> %d", "test", 2333);
+    printf("%s\n", test);
+
     return 0;
 }
diff --git a/src/common/sundry.c b/src/common/sundry.c
index bb6ff2c..ab5e9de 100644
--- a/src/common/sundry.c
+++ b/src/common/sundry.c
@@ -1,8 +1,9 @@
 #include <stdio.h>
+#include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/time.h>
 #include <unistd.h>
+#include <sys/time.h>
 #include "logger.h"
 #include "constant.h"
 #include "structure.h"
@@ -19,6 +20,14 @@ char* string_join(const char *base, const char *add) { // combine string
     return strcat(strcpy(ret, base), add);
 }
 
+char* string_load(const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    char *buf = NULL;
+    vasprintf(&buf, fmt, ap);
+    return buf;
+}
+
 char* uint32_to_string(uint32_t number) { // convert uint32 -> string
     char to_str[11]; // MAX_LEN(uint32) -> 4294967296(10-bytes)
     sprintf(to_str, "%u", number);