fix some bugs in c codes (#1089)

codes/c/chapter_tree/binary_search_tree.c

@@ -6,7 +6,7 @@
 
 #include "../utils/common.h"
 
-/* 二叉搜索树你结构体 */
+/* 二叉搜索树结构体 */
 typedef struct {
     TreeNode *root;
 } BinarySearchTree;

codes/c/utils/common_test.c

@@ -25,7 +25,7 @@ void testTreeNode() {
     printTree(root);
 
     // tree to arr
-    int *arr = treeToArray(root, size);
+    int *arr = treeToArray(root, &size);
     printArray(arr, size);
 }