Add space_complexit under C and fix memory leak under CPP (#456)

* fix(codes/cpp): Memory leak fix: the space was not freed when pop removed the element.

* fix(codes/cpp): Fix access error when printArray(arr, 0)

* fix(codes/cpp): Fix memory leaks: replace pointers with local variables, no need to manage memory

* fix(codes/cpp): Fix memory leaks: no delete

* fix(codes/cpp): Fix memory leaks: Add destructor ~ArrayHashMap()

* Update PrintUtil.hpp

* feat(codes/c): Add three-party hash implementation

* feat(codes/c): Add freeMemoryTree in tree_node.h

* feat(codes/c): Add space_complexity.c

* styles(codes/c): Modify format

* feat(codes/cpp): Undo a previous delete, there is no memory leak here

* Update array_hash_map.cpp

* Update include.h

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/c/include/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_executable(include
         include_test.c
         include.h print_util.h
-        list_node.h tree_node.h)
+        list_node.h tree_node.h
+        uthash.h)

codes/c/include/include.h

@@ -18,6 +18,9 @@
 #include "tree_node.h"
 #include "print_util.h"
 
+// hash table lib
+#include "uthash.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif

codes/c/include/tree_node.h

@@ -124,6 +124,15 @@ int *treeToArr(TreeNode *root) {
     return arr;
 }
 
+/* Free the memory allocated to a tree */
+void freeMemoryTree(TreeNode *root) {
+    if (root == NULL)
+        return;
+    freeMemoryTree(root->left);
+    freeMemoryTree(root->right);
+    // 释放内存
+    free(root);
+}
 #ifdef __cplusplus
 }
 #endif