这是跳过文本文件中的一行的正确方法吗？

Question

从事有关预订系统的项目。此功能是删除文本文件中的一行。当我运行此程序时，什么也没发生。

CustomerD.txt用于记录所有删除预订的学生。 Backup.txt用于临时文件。

int del()
{
    FILE *in, *out, *stay;
    char ch, conf;
    int  temp = 0;
    int id;
    in = fopen("Customer.txt", "r");
    out = fopen("Backup.txt", "w+");
    stay = fopen("CustomerD.txt","w+");
    if (in == NULL)
     {
       printf("\nCannot Open the Source file");
         exit(1);
      } 
    if (out == NULL) {
        printf("\nCannot create Target File\n");
        exit(1);
        }
     printf("Enter your id :");
    scanf("%d", &id);
   ch = fgetc(in);
   while (ch!= EOF)
    {
        if (id!=s->id)
    {
        ch = fgetc(in);
        fputc(ch, out);
    }
    else {
        ch = fgetc(in);
        fputc(ch, stay);
    }
    }
    printf("Your Deletion is done");
    fclose("Customer.txt");
fclose("Backup.txt");
fclose("CustomerD.txt");
remove("Customer.txt");
if (remove("Customer.txt") == 0)
    printf("Deleted successfully");
else
    printf("Unable to delete the file");
rename("Backup.txt","Customer.txt");
return 0;
  }