Memory함수 소스코드 다시수정했어요ㅠㅠ

#include <stdio.h>
#include <stdlib.h> 
#include <memory.h>
 
typedef struct treeNode {
 int data;
 struct treeNode *left, *right; 
} treeNode;
 
//    n1
//
//   n2  n3
 
 main ()
{
 
    treeNode *n1, *n2, *n3;
    n1 = (treeNode *) malloc(sizeof(treeNode)); 
    n2 = (treeNode *) malloc(sizeof(treeNode)); 
    n3 = (treeNode *) malloc(sizeof(treeNode)); 
    n1->data =10;
    n1->left =n2;
    n1->right=n3;
    n2->data =20;
    n2->left =NULL;
    n2->right=NULL;
    n3->data =30;
    n3->left =NULL;
    n3->right=NULL;
}