Считать файл в два списка и записать обратно в файл - C (СИ)

#include <stdio.h>
#include<stdlib.h>
#define CHARS 30
#define NAMES 20

int main(void)
{
    int count=-1;
    int index1=0,index2=0, i=0;
    char list1[NAMES][CHARS],list2[NAMES][CHARS];
 
    struct NODE {
       char name[CHARS];
       struct NODE *next;
    };
    typedef struct NODE Node;
    FILE *fp, *out;
    Node* head;
    Node *curr, *n;
    head=(Node*)malloc(sizeof(Node));
    curr=head;
 
/* open the file and load the strings into 2 arrays  */
     if((fp=fopen("merge.dat","r"))==NULL)
         printf("Cannot open file fot reading");
        exit(1);
    
     while (!feof(fp))
     {
       count++;
       fscanf(fp,"%s %s ",list1[count],list2[count]);
     }
     fclose(fp);
 
     for(i=0; i<8; ++i)
         printf("%s\n", list1[i]);
 
/*copys names from both lists until one of the lists is finished*/
 
     while(index1<=count&&index2<=count)
     { 
        curr->next=(Node*)malloc(sizeof(Node));    /*allocate space for next node*/
        curr=curr->next;                    /* point curr to new allocated space*/
         
        if(strcmp(list1[index1], list2[index2])>0)      /*compare list1 and list2*/
        {
            strcpy(curr->name, list1[index1]);
            ++index1;
        }
        else 
        {
            strcpy(curr->name, list2[index2]);
            ++index2;
        }
     }

/*finish off the list that isn't finished*/
 
     for(i=index1; i<=count; ++index1)
     {
        curr->next=(Node*)malloc(sizeof(Node));
        curr=curr->next;
            strcpy(curr->name, list1[index1]);
            ++index1;
     }
 
     for(i=index2; i<=count; ++index2)
     {
        curr->next=(Node*)malloc(sizeof(Node));
        curr=curr->next;
            strcpy(curr->name, list2[index2]);
            ++index2;
     }
 
     curr->next=NULL; 
     curr=head;
 
    while(curr!=NULL)
    {
         printf(out, "%s\n", curr->name);
         curr=curr->next;
    }
    
/*writing list back to the file*/
 
    if((out=fopen("merge.dat","w"))==NULL)
        printf("Cannot open file for writing\n");
    
    while(curr!=NULL)
    {
         fprintf(out, "%s\n", curr->name);
         curr=curr->next;
    }
    fclose(out);
 
    for (curr = head; curr != NULL; curr=n) 
    {
        n = curr->next;
        free(curr);
    }
 
    return 0;
 
}