怎样构建哈夫曼树 C语言大师帮帮忙

//以前写过的.你参考一下.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <conio.h>

typedef struct {
unsigned int weight;
unsigned int parent,lchild,rchild;
} HTNode,*HuffmanTree;

typedef char **HuffmanCode;

typedef struct {
unsigned int s1;
unsigned int s2;
} MinCode;

void Error(char *message);
HuffmanCode HuffmanCoding(HuffmanTree HT,HuffmanCode HC,unsigned int *w,unsigned int n);
MinCode Select(HuffmanTree HT,unsigned int n);

void Error(char *message)
{
fprintf(stderr,"Error:%s\n",message);
exit(1);
}

HuffmanCode HuffmanCoding(HuffmanTree HT,HuffmanCode