diff --git a/9 Algorithms Job Interview/1 字符串.md b/9 Algorithms Job Interview/1 字符串.md
index c77468f..30960ee 100644
--- a/9 Algorithms Job Interview/1 字符串.md	
+++ b/9 Algorithms Job Interview/1 字符串.md	
@@ -39,6 +39,7 @@ a = a - b;
 最终示例代码：
 
 ```
+//反转
 void _reverse(char *start,char *end){
 	if ((start == NULL) || (end == NULL)) return;
 	while(start < end){
@@ -55,11 +56,15 @@ char *revert_by_word(char *source){
 	char *end = source;
 	char *start = source;
 	if (source == NULL) return NULL;
+	
+	//end指针挪动到尾部
 	while (*end != '\0') end++;
 	end--;
 
+	//先全部反转
 	_reverse(start,end);
 
+	//按单词反转
 	start=end=source;
 	while(*start != '\0'){
 		if (*start == ' '){
@@ -94,7 +99,9 @@ char *left_rotate(char *str,int offset){
 }
 ```
 
-思路： 我们可以abcdef分成两部分，ab和cdef，内部逆序以后，整体再次逆序，就可以得到想要的结果了，也就是跟上面的问题是同样的问题。
+思路： 我们可以abcdef分成两部分，ab和cdef，内部逆序以后，整体再次逆序，就可以得到想要的结果了。
+也就是跟上面的问题是同样的问题。
+
 
 
 ## 判断字符串是否是回文
diff --git a/9 Algorithms Job Interview/测试代码/1 string/char_first_appear_once.c b/9 Algorithms Job Interview/codes/1 string/char_first_appear_once.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/1 string/char_first_appear_once.c
rename to 9 Algorithms Job Interview/codes/1 string/char_first_appear_once.c
diff --git a/9 Algorithms Job Interview/测试代码/1 string/proc.c b/9 Algorithms Job Interview/codes/1 string/proc.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/1 string/proc.c
rename to 9 Algorithms Job Interview/codes/1 string/proc.c
diff --git a/9 Algorithms Job Interview/测试代码/1 string/replce_blank.c b/9 Algorithms Job Interview/codes/1 string/replce_blank.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/1 string/replce_blank.c
rename to 9 Algorithms Job Interview/codes/1 string/replce_blank.c
diff --git a/9 Algorithms Job Interview/测试代码/1 string/revert_by_word.c b/9 Algorithms Job Interview/codes/1 string/revert_by_word.c
similarity index 92%
rename from 9 Algorithms Job Interview/测试代码/1 string/revert_by_word.c
rename to 9 Algorithms Job Interview/codes/1 string/revert_by_word.c
index da95e3a..ea113b1 100644
--- a/9 Algorithms Job Interview/测试代码/1 string/revert_by_word.c	
+++ b/9 Algorithms Job Interview/codes/1 string/revert_by_word.c	
@@ -51,7 +51,7 @@ int main(int argc, char const *argv[])
 	char *test = "how are you ?";
 	printf("%s\n",_revert_by_word(test));
 
-	//char *test = "I am a  student.";
-	//printf("%s\n",revert_by_word(test));
+	test = "I am a  student.";
+	printf("%s\n",revert_by_word(test));
 	return 0;
 }
diff --git a/9 Algorithms Job Interview/测试代码/1 string/string.c b/9 Algorithms Job Interview/codes/1 string/string.c
similarity index 99%
rename from 9 Algorithms Job Interview/测试代码/1 string/string.c
rename to 9 Algorithms Job Interview/codes/1 string/string.c
index 88fe732..9d778b2 100644
--- a/9 Algorithms Job Interview/测试代码/1 string/string.c	
+++ b/9 Algorithms Job Interview/codes/1 string/string.c	
@@ -264,7 +264,7 @@ void compress(char *src){
 	}
 
 	int count = 1;
-	char *back=src,forward=src+1;
+	char *back=src,*forward=src+1;
 
 	while(*forward){
 
diff --git a/9 Algorithms Job Interview/测试代码/10.c b/9 Algorithms Job Interview/codes/10.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/10.c
rename to 9 Algorithms Job Interview/codes/10.c
diff --git a/9 Algorithms Job Interview/测试代码/12.c b/9 Algorithms Job Interview/codes/12.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/12.c
rename to 9 Algorithms Job Interview/codes/12.c
diff --git a/9 Algorithms Job Interview/测试代码/20.c b/9 Algorithms Job Interview/codes/20.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/20.c
rename to 9 Algorithms Job Interview/codes/20.c
diff --git a/9 Algorithms Job Interview/测试代码/21.c b/9 Algorithms Job Interview/codes/21.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/21.c
rename to 9 Algorithms Job Interview/codes/21.c
diff --git a/9 Algorithms Job Interview/测试代码/22.c b/9 Algorithms Job Interview/codes/22.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/22.c
rename to 9 Algorithms Job Interview/codes/22.c
diff --git a/9 Algorithms Job Interview/测试代码/23.c b/9 Algorithms Job Interview/codes/23.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/23.c
rename to 9 Algorithms Job Interview/codes/23.c
diff --git a/9 Algorithms Job Interview/测试代码/24.c b/9 Algorithms Job Interview/codes/24.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/24.c
rename to 9 Algorithms Job Interview/codes/24.c
diff --git a/9 Algorithms Job Interview/测试代码/25.c b/9 Algorithms Job Interview/codes/25.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/25.c
rename to 9 Algorithms Job Interview/codes/25.c
diff --git a/9 Algorithms Job Interview/测试代码/26.c b/9 Algorithms Job Interview/codes/26.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/26.c
rename to 9 Algorithms Job Interview/codes/26.c
diff --git a/9 Algorithms Job Interview/测试代码/27.c b/9 Algorithms Job Interview/codes/27.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/27.c
rename to 9 Algorithms Job Interview/codes/27.c
diff --git a/9 Algorithms Job Interview/测试代码/28.c b/9 Algorithms Job Interview/codes/28.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/28.c
rename to 9 Algorithms Job Interview/codes/28.c
diff --git a/9 Algorithms Job Interview/测试代码/4 numer/Power.c b/9 Algorithms Job Interview/codes/4 numer/Power.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/4 numer/Power.c
rename to 9 Algorithms Job Interview/codes/4 numer/Power.c
diff --git a/9 Algorithms Job Interview/测试代码/4 numer/integer_to_bin.c b/9 Algorithms Job Interview/codes/4 numer/integer_to_bin.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/4 numer/integer_to_bin.c
rename to 9 Algorithms Job Interview/codes/4 numer/integer_to_bin.c
diff --git a/9 Algorithms Job Interview/测试代码/4 numer/isSquare.c b/9 Algorithms Job Interview/codes/4 numer/isSquare.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/4 numer/isSquare.c
rename to 9 Algorithms Job Interview/codes/4 numer/isSquare.c
diff --git a/9 Algorithms Job Interview/测试代码/4 numer/one_appear_count_by_binary.c b/9 Algorithms Job Interview/codes/4 numer/one_appear_count_by_binary.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/4 numer/one_appear_count_by_binary.c
rename to 9 Algorithms Job Interview/codes/4 numer/one_appear_count_by_binary.c
diff --git a/9 Algorithms Job Interview/测试代码/4 numer/string_to_integer.c b/9 Algorithms Job Interview/codes/4 numer/string_to_integer.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/4 numer/string_to_integer.c
rename to 9 Algorithms Job Interview/codes/4 numer/string_to_integer.c
diff --git a/9 Algorithms Job Interview/测试代码/4-1.c b/9 Algorithms Job Interview/codes/4-1.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/4-1.c
rename to 9 Algorithms Job Interview/codes/4-1.c
diff --git a/9 Algorithms Job Interview/测试代码/5 array/delete_occurence_character.c b/9 Algorithms Job Interview/codes/5 array/delete_occurence_character.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/5 array/delete_occurence_character.c
rename to 9 Algorithms Job Interview/codes/5 array/delete_occurence_character.c
diff --git a/9 Algorithms Job Interview/测试代码/5 array/factorial.c b/9 Algorithms Job Interview/codes/5 array/factorial.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/5 array/factorial.c
rename to 9 Algorithms Job Interview/codes/5 array/factorial.c
diff --git a/9 Algorithms Job Interview/测试代码/5 array/fibonacci.c b/9 Algorithms Job Interview/codes/5 array/fibonacci.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/5 array/fibonacci.c
rename to 9 Algorithms Job Interview/codes/5 array/fibonacci.c
diff --git a/9 Algorithms Job Interview/测试代码/5 array/longest_continuious_number.c b/9 Algorithms Job Interview/codes/5 array/longest_continuious_number.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/5 array/longest_continuious_number.c
rename to 9 Algorithms Job Interview/codes/5 array/longest_continuious_number.c
diff --git a/9 Algorithms Job Interview/测试代码/5 array/print_continuous_sequence_sum.c b/9 Algorithms Job Interview/codes/5 array/print_continuous_sequence_sum.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/5 array/print_continuous_sequence_sum.c
rename to 9 Algorithms Job Interview/codes/5 array/print_continuous_sequence_sum.c
diff --git a/9 Algorithms Job Interview/测试代码/5.c b/9 Algorithms Job Interview/codes/5.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/5.c
rename to 9 Algorithms Job Interview/codes/5.c
diff --git a/9 Algorithms Job Interview/测试代码/6 matrix/print_matrix.c b/9 Algorithms Job Interview/codes/6 matrix/print_matrix.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/6 matrix/print_matrix.c
rename to 9 Algorithms Job Interview/codes/6 matrix/print_matrix.c
diff --git a/9 Algorithms Job Interview/测试代码/7 bianrytree/binary_search.c b/9 Algorithms Job Interview/codes/7 bianrytree/binary_search.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/7 bianrytree/binary_search.c
rename to 9 Algorithms Job Interview/codes/7 bianrytree/binary_search.c
diff --git a/9 Algorithms Job Interview/测试代码/bt1.c b/9 Algorithms Job Interview/codes/7 bianrytree/bt1.c
similarity index 71%
rename from 9 Algorithms Job Interview/测试代码/bt1.c
rename to 9 Algorithms Job Interview/codes/7 bianrytree/bt1.c
index 8816c9e..7e72477 100644
--- a/9 Algorithms Job Interview/测试代码/bt1.c	
+++ b/9 Algorithms Job Interview/codes/7 bianrytree/bt1.c	
@@ -3,11 +3,9 @@
 二叉查找树变成双向链表
 */
 
-strcut BSTreeNode{
-
+typedef struct BSTreeNode{
 	int m_nValue;
-	BSTreeNode *m_pLeft,m_pRight;
-
+	struct BSTreeNode *m_pLeft, *m_pRight;
 }BSTree;
 
 void convertDoubleLinks(BSTree *root){
diff --git a/9 Algorithms Job Interview/测试代码/7.c b/9 Algorithms Job Interview/codes/7.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/7.c
rename to 9 Algorithms Job Interview/codes/7.c
diff --git a/9 Algorithms Job Interview/测试代码/8.c b/9 Algorithms Job Interview/codes/8.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/8.c
rename to 9 Algorithms Job Interview/codes/8.c
diff --git a/9 Algorithms Job Interview/测试代码/c1.c b/9 Algorithms Job Interview/codes/c1.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c1.c
rename to 9 Algorithms Job Interview/codes/c1.c
diff --git a/9 Algorithms Job Interview/测试代码/c10.c b/9 Algorithms Job Interview/codes/c10.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c10.c
rename to 9 Algorithms Job Interview/codes/c10.c
diff --git a/9 Algorithms Job Interview/测试代码/c11-2.c b/9 Algorithms Job Interview/codes/c11-2.c
similarity index 90%
rename from 9 Algorithms Job Interview/测试代码/c11-2.c
rename to 9 Algorithms Job Interview/codes/c11-2.c
index fda7caf..e5c3e4b 100644
--- a/9 Algorithms Job Interview/测试代码/c11-2.c	
+++ b/9 Algorithms Job Interview/codes/c11-2.c	
@@ -12,7 +12,7 @@
   int main()
   {
      char ch = 'a';
-     foobar1(33, ch);
+     foobar1();
      foobar2();
      return 0;
   }
diff --git a/9 Algorithms Job Interview/测试代码/c11.c b/9 Algorithms Job Interview/codes/c11.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c11.c
rename to 9 Algorithms Job Interview/codes/c11.c
diff --git a/9 Algorithms Job Interview/测试代码/c12.c b/9 Algorithms Job Interview/codes/c12.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c12.c
rename to 9 Algorithms Job Interview/codes/c12.c
diff --git a/9 Algorithms Job Interview/测试代码/c13-1.c b/9 Algorithms Job Interview/codes/c13-1.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c13-1.c
rename to 9 Algorithms Job Interview/codes/c13-1.c
diff --git a/9 Algorithms Job Interview/测试代码/c13-2.c b/9 Algorithms Job Interview/codes/c13-2.c
similarity index 85%
rename from 9 Algorithms Job Interview/测试代码/c13-2.c
rename to 9 Algorithms Job Interview/codes/c13-2.c
index 7b8ea97..cbb3ff5 100644
--- a/9 Algorithms Job Interview/测试代码/c13-2.c	
+++ b/9 Algorithms Job Interview/codes/c13-2.c	
@@ -1,9 +1,8 @@
  #include "c13-1.c"
 
- extern int *arr;
+
   int main()
   {
-      arr[1] = 100;
       return 0;
   }
 
diff --git a/9 Algorithms Job Interview/测试代码/c14.c b/9 Algorithms Job Interview/codes/c14.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c14.c
rename to 9 Algorithms Job Interview/codes/c14.c
diff --git a/9 Algorithms Job Interview/测试代码/c15.c b/9 Algorithms Job Interview/codes/c15.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c15.c
rename to 9 Algorithms Job Interview/codes/c15.c
diff --git a/9 Algorithms Job Interview/测试代码/c16.c b/9 Algorithms Job Interview/codes/c16.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c16.c
rename to 9 Algorithms Job Interview/codes/c16.c
diff --git a/9 Algorithms Job Interview/测试代码/c17.c b/9 Algorithms Job Interview/codes/c17.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c17.c
rename to 9 Algorithms Job Interview/codes/c17.c
diff --git a/9 Algorithms Job Interview/测试代码/c18.c b/9 Algorithms Job Interview/codes/c18.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c18.c
rename to 9 Algorithms Job Interview/codes/c18.c
diff --git a/9 Algorithms Job Interview/测试代码/c19.c b/9 Algorithms Job Interview/codes/c19.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c19.c
rename to 9 Algorithms Job Interview/codes/c19.c
diff --git a/9 Algorithms Job Interview/测试代码/c2.c b/9 Algorithms Job Interview/codes/c2.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c2.c
rename to 9 Algorithms Job Interview/codes/c2.c
diff --git a/9 Algorithms Job Interview/测试代码/c20.c b/9 Algorithms Job Interview/codes/c20.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c20.c
rename to 9 Algorithms Job Interview/codes/c20.c
diff --git a/9 Algorithms Job Interview/测试代码/c3.c b/9 Algorithms Job Interview/codes/c3.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c3.c
rename to 9 Algorithms Job Interview/codes/c3.c
diff --git a/9 Algorithms Job Interview/测试代码/c4.c b/9 Algorithms Job Interview/codes/c4.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c4.c
rename to 9 Algorithms Job Interview/codes/c4.c
diff --git a/9 Algorithms Job Interview/测试代码/c5.c b/9 Algorithms Job Interview/codes/c5.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c5.c
rename to 9 Algorithms Job Interview/codes/c5.c
diff --git a/9 Algorithms Job Interview/测试代码/c6.c b/9 Algorithms Job Interview/codes/c6.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c6.c
rename to 9 Algorithms Job Interview/codes/c6.c
diff --git a/9 Algorithms Job Interview/测试代码/c7.c b/9 Algorithms Job Interview/codes/c7.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c7.c
rename to 9 Algorithms Job Interview/codes/c7.c
diff --git a/9 Algorithms Job Interview/测试代码/c8.c b/9 Algorithms Job Interview/codes/c8.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c8.c
rename to 9 Algorithms Job Interview/codes/c8.c
diff --git a/9 Algorithms Job Interview/测试代码/c9.c b/9 Algorithms Job Interview/codes/c9.c
similarity index 100%
rename from 9 Algorithms Job Interview/测试代码/c9.c
rename to 9 Algorithms Job Interview/codes/c9.c
diff --git a/9 Algorithms Job Interview/测试代码/most_visit_ip.c b/9 Algorithms Job Interview/codes/most_visit_ip.c
similarity index 99%
rename from 9 Algorithms Job Interview/测试代码/most_visit_ip.c
rename to 9 Algorithms Job Interview/codes/most_visit_ip.c
index 5c64dca..8ca03fd 100644
--- a/9 Algorithms Job Interview/测试代码/most_visit_ip.c	
+++ b/9 Algorithms Job Interview/codes/most_visit_ip.c	
@@ -8,17 +8,12 @@
 #define test_file_path "./ip.txt"
 #define ip_count 100000000 //随机1亿个IP
 #define tmp_file_count 32
-
 #define mem_count 128*1024*1028 //128MB个IP空间
 
-
 int hash(unsigned i){
-
 	return i>>27;
-
 }
 
-
 int main(){
 
 
@@ -52,9 +47,6 @@ int main(){
 		}
 	}
 
-
-
-
 	//开始读测试数据IP，按IP，映射到32个文件中
 	FILE *testfd = fopen(test_file_path2,"r");
 	if (!testfd)
@@ -76,8 +68,6 @@ int main(){
 	}
 
 
-
-
 	// 依次读入每个文件并统计， hash_map 统计每个区间段的最大IP
 	int hash_map[mem_count]; 
 	int max_ip;