修改拼写错误 && 格式化代码

1，将EVENT_CB(ev)宏函数中的handle参数强制类型转换为BtnCallback类型定义一致，而不是在函数调用时通过传递参数做隐性的类型转换。
2，#include 改用<>，引入系统头文件。

multi_button.c

@@ -5,7 +5,7 @@
 
 #include "multi_button.h"
 
-#define EVENT_CB(ev)   if(handle->cb[ev])handle->cb[ev]((Button*)handle)
+#define EVENT_CB(ev)   if(handle->cb[ev])handle->cb[ev]((void*)handle)
 
 //button handle list head.
 static struct Button* head_handle = NULL;
@@ -142,7 +142,7 @@ static void button_handler(struct Button* handle)
 			//continue hold trigger
 			handle->event = (uint8_t)LONG_PRESS_HOLD;
 			EVENT_CB(LONG_PRESS_HOLD);
-		} else { //releasd
+		} else { //released
 			handle->event = (uint8_t)PRESS_UP;
 			EVENT_CB(PRESS_UP);
 			handle->state = 0; //reset

multi_button.h

@@ -6,8 +6,8 @@
 #ifndef _MULTI_BUTTON_H_
 #define _MULTI_BUTTON_H_
 
-#include "stdint.h"
+#include <stdint.h>
-#include "string.h"
+#include <string.h>
 
 //According to your need to modify the constants.
 #define TICKS_INTERVAL    5	//ms