删除树节点段错误，不会改啊，忘高手指点，谢谢

#include<stdio.h>
#include<stdlib.h>

#define N 10

typedef struct tree{
     int data;
     struct tree *left;
     struct tree *right;

 }Tree;

void insert_tree(Tree *root,int value)

 {
     while(root)
     {
         if(root->data==value)    return;
         if(root->data>value)
         {
             if(root->left)    root=root->left;
             else
             {   
                 Tree *t=init_tree(value);
                 root->left=t;
                 return;
             }
         }
         else//(root->data<value)
        {
             if(root->right)    root=root->right;
             else   
             {
                 Tree *t=init_tree(value);
                 root->right=t;
                 return;
             }
         }
     }

 }

void inorder(Tree *root)

 {
     if(root==NULL)    return;
     inorder(root->left);
     printf("%d\n",root->data);
     inorder(root->right);

 }



void levelorder(Tree *root)

 {
     Tree *t;
     Queue *q=(Queue *)malloc(sizeof(Queue));
     init_queue(q);
     inqueue(q,root);
     while(q->f!=q->r)
     {
         t=dequeue(q);
         printf("%d\n",t->data);
         if(t->left)        inqueue(q,t->left);
         if(t->right)    inqueue(q,t->right);
     }

 }



 Tree *search_max(Tree *root)//找一个节点可以取代找到的那个节点
{
     Tree *temp;
     if(!root->right&&!root->left)    return NULL;
     if(!root->right&&root->left)
     {
         temp=root->left;
         root->left=NULL;
         return temp;
     }
     if(root->right&&!root->left)
     {
         temp=root->right;
         root->right=NULL;
         return temp;
     }
     if(root->right&&root->left&&root->left->right==NULL)
     {
         temp=root->right;
         root->right=NULL;
         return temp;
     }
     root=root->left;
     while(root->right->right)
         root=root->right;
     temp=root->right;
     root->right=NULL;
     return temp;

 }


 Tree *search(Tree *root,int value)

 {
     if(root==NULL)    return NULL;
     if(root->data==NULL)    return NULL;
     while(1)
     {
         if(root->data>value)
         {
             if(root->left==NULL)    return NULL;
             else if(root->left->data==value)
                 return root;
             else
                 root=root->left;
         }
         if(root->data<value)
         {
             if(root->right==NULL)    return NULL;
             else if(root->right->data==value)
                 return root;
             else
                 root=root->right;
         }
     }

 }

int extent(Tree *root)//计算节点的度
{
     if(!root->right&&root->left)
         return 0;
     if(root->right&&!root->left)
         return 1;
     if(root->right&&root->left)
         return 2;

 }

void delet_tree(Tree *root,int value)

 {
     Tree *s;
     Tree *node;
     Tree *temp;
     if(!search(root,value))    return ;
     node=search(root,value);
     
     if(node->left->data==value)
     {
         temp=search_max(node->left);
         if(!temp)   
         {
             s=node->left;
             node->left=NULL;
             free(s);
         }
         else
         {
             s=node->left;
             node->left=temp;
             if(extent(s)==0)
             {
                 temp->left=s->left;
             }
             if(extent(s)==1)
             {
                 temp->right=s->right;
             }
             if(extent(s)==2)
             {
                 temp->left=s->left;
                 temp->right=s->right;
             }
             free(s);
         }
     }
     if(node->right->data==value)
     {
         temp=search_max(node->right);
         if(!temp)   
         {
             s=node->right;
             node->right=NULL;
             free(s);
         }
         else
         {
             s=node->right;
             node->right=temp;
             if(extent(s)==0)
             {
                 temp->right=s->right;
             }
             if(extent(s)==1)
             {
                 temp->left=s->left;
             }
             if(extent(s)==2)
             {
                 temp->left=s->left;
                 temp->right=s->right;
             }
             free(s);
         }
     }
     
     

 }

void main()

 {
     int i;
     Tree *root=(Tree *)malloc(sizeof(Tree));
     root->data=N/2;
     root->right=NULL;
     root->left=NULL;
     
     for(i=0;i<N;i++)
         insert_tree(root,random()%N);
     //levelorder(root);
    delet_tree(root,7);
     levelorder(root);

 }