diff --git a/examples/example_callback.c b/examples/example_callback.c
index 2c9f267..99ffff2 100644
--- a/examples/example_callback.c
+++ b/examples/example_callback.c
@@ -15,15 +15,10 @@ uint8_t read_button_GPIO(uint8_t button_id)
 	{
 		case btn1_id:
 			return HAL_GPIO_ReadPin(B1_GPIO_Port, B1_Pin);
-			break;
-
 		case btn2_id:
 			return HAL_GPIO_ReadPin(B2_GPIO_Port, B2_Pin);
-			break;
-
 		default:
 			return 0;
-			break;
 	}
 }
 
diff --git a/examples/example_poll.c b/examples/example_poll.c
index 162b357..eb06029 100644
--- a/examples/example_poll.c
+++ b/examples/example_poll.c
@@ -10,11 +10,8 @@ uint8_t read_button_GPIO(uint8_t button_id)
 	{
 		case btn1_id:
 			return HAL_GPIO_ReadPin(B1_GPIO_Port, B1_Pin);
-			break;
-
 		default:
 			return 0;
-			break;
 	}
 }
 
@@ -22,19 +19,19 @@ uint8_t read_button_GPIO(uint8_t button_id)
 int main()
 {
 	static uint8_t btn1_event_val;
-	
+
 	button_init(&btn1, read_button_GPIO, 0, btn1_id);
 	button_start(&btn1);
-	
+
 	//make the timer invoking the button_ticks() interval 5ms.
 	//This function is implemented by yourself.
-	__timer_start(button_ticks, 0, 5); 
-	
-	while(1) 
+	__timer_start(button_ticks, 0, 5);
+
+	while(1)
 	{
 		if(btn1_event_val != get_button_event(&btn1)) {
 			btn1_event_val = get_button_event(&btn1);
-			
+
 			if(btn1_event_val == PRESS_DOWN) {
 				//do something
 			} else if(btn1_event_val == PRESS_UP) {
@@ -45,4 +42,3 @@ int main()
 		}
 	}
 }
-