C언어 파일 입출력 너무 어렵네요ㅠ.ㅠ

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define MAX 100
 
typedef struct words {
    char * word;//단어
    struct words * next;//next
}Word;
 
void getword(void);
void insert(char *);
void cmp(char *);
void print(void);
 
Word * start=NULL;
 
void main(void)
{
    getword();
}
void getword(void)
{ 
    char ch,buff[MAX];
    int k=0;
    FILE * fp;
    fp=fopen("test.txt","r");
    if(fp==NULL)
    {
        printf("\n\n\t파일이 없습니다!!\n");
        exit(1);
    }
    else
    {  
        while((ch=fgetc(fp))!=EOF)
        {
            if(isalpha((unsigned char)ch))
                buff[k++]=ch;
            else if(ch==' ' || ch=='\n' || ch=='\t')
            {
                if(k)
                {     
                    buff[k]='\0';     
                    cmp(buff);  
                    k=0;    
                }
 
            }
 
           else
 
              k=0;
        }  
    }
    print();
    fclose(fp);
}
void cmp(char * buff)
{
    Word * cur=start;
    if(start==NULL || (strcmp(start->word,buff))>0);
    else
    {         
        while(cur->next!=NULL)
        {
            if(!strcmp(cur->word,buff))
                return;
            cur=cur->next;
        }
        if(!strcmp(cur->word,buff))
            return;
    }
    insert(buff); 
}
 
void insert(char * buff)
{
    Word * temp, * cur=start;  
    temp=(Word*)malloc(sizeof(Word));
    temp->next=NULL;
    temp->word=(char*)malloc(sizeof(strlen(buff))+1);
    strcpy(temp->word,buff);
    if(start==NULL || (strcmp(start->word,temp->word))>=0)
    {
        temp->next=start;
        start=temp;  
    }
    else
    {
        while(cur->next!=NULL)
        {
            if(strcmp(cur->next->word,temp->word)>=0)
            {
                temp->next=cur->next;
                cur->next=temp;
                return;
            }
            cur=cur->next;
        }
        cur->next=temp;
    }
}
 
void print(void)
{
    Word * cur=start;
    int nCnt=0;
    FILE * ptr;
    ptr=fopen("result.txt","w");
    while(cur->next!=NULL)
    {            
        printf("%-15s",cur->word);
        fprintf(ptr,"%-15s",cur->word);
        nCnt++;
        if(!(nCnt%5))
        {
            printf("\n");
            fprintf(ptr,"\n");
        }
        else
        {           
            printf("\t");
            fprintf(ptr,"\t");
        }
        cur=cur->next;
    }
    printf("%-15s",cur->word);
    fprintf(ptr,"%-15s",cur->word);
    fclose(ptr);
}