#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct node* tree_pointer;
typedef struct node{
tree_pointer left_child;
tree_pointer right_child;
char data;
}tree;
int find_index(char* arr,char data);//找到对应值在数组的索引
void create_tree(tree **node,char *preorder,char *inorder);
int num;
int Index=