diff --git a/how_to_use_mqtt/pub1.c b/how_to_use_mqtt/pub1.c
index 60dbcb0..47ba790 100644
--- a/how_to_use_mqtt/pub1.c
+++ b/how_to_use_mqtt/pub1.c
@@ -4,29 +4,35 @@
 #include <stdlib.h>
 #include <string.h>
 int isConnected = 0;
-void connect_callback(struct mosquitto* mosq, void* obj, int rc) {
-    if (rc == 0) {
+void connect_callback(struct mosquitto *mosq, void *obj, int rc)
+{
+    if (rc == 0)
+    {
         printf("---连接服务器成功---\n");
         isConnected = 1;
     }
 }
-int main(int argc, char const* argv[]) {
-    if (argc < 3) {
+int main(int argc, char const *argv[])
+{
+    if (argc < 3)
+    {
         printf("format: ./pub1 msgid topic msg");
         return -1;
     }
     mosquitto_lib_init();
-    struct mosquitto* client = mosquitto_new(NULL, true, NULL);
+    struct mosquitto *client = mosquitto_new(NULL, true, NULL);
     mosquitto_connect_callback_set(client, connect_callback);
     mosquitto_connect(client, "10.12.156.19", 1883, 60);
     mosquitto_loop_start(client);
     while (isConnected == 0)
-        int msg_id = atoi(argv[1]);
-    char* topic = (char*)argv[2];
-    char* msg = (char*)argv[3];
+        ;
+    int msg_id = atoi(argv[1]);
+    char *topic = (char *)argv[2];
+    char *msg = (char *)argv[3];
     int flag =
         mosquitto_publish(client, &msg_id, topic, strlen(msg), msg, 1, true);
-    if (flag == MOSQ_ERR_SUCCESS) {
+    if (flag == MOSQ_ERR_SUCCESS)
+    {
         printf("---消息发布成功: %s(%d):%s---\n", topic, msg_id, msg);
         mosquitto_destroy(client);
         mosquitto_lib_cleanup();