Apply clang format for samples files (#833)

Apply clang format for c source files under samples folder

samples/simple/wasm-apps/event_publisher.c

@@ -9,7 +9,8 @@
 
 int num = 0;
 
-void publish_overheat_event()
+void
+publish_overheat_event()
 {
     attr_container_t *event;
 
@@ -17,18 +18,20 @@ void publish_overheat_event()
     attr_container_set_string(&event, "warning", "temperature is over high");
 
     api_publish_event("alert/overheat", FMT_ATTR_CONTAINER, event,
-            attr_container_get_serialize_length(event));
+                      attr_container_get_serialize_length(event));
 
     attr_container_destroy(event);
 }
 
 /* Timer callback */
-void timer1_update(user_timer_t timer)
+void
+timer1_update(user_timer_t timer)
 {
     publish_overheat_event();
 }
 
-void start_timer()
+void
+start_timer()
 {
     user_timer_t timer;
 
@@ -37,12 +40,15 @@ void start_timer()
     api_timer_restart(timer, 1000);
 }
 
-void on_init()
+void
+on_init()
 {
     start_timer();
 }
 
-void on_destroy()
+void
+on_destroy()
 {
-    /* real destroy work including killing timer and closing sensor is accomplished in wasm app library version of on_destroy() */
+    /* real destroy work including killing timer and closing sensor is
+       accomplished in wasm app library version of on_destroy() */
 }