🚀 go-pugleaf

Hi all,
    I have been trying to delete some characters
from a text file with the below routine and it  only
replaces the characters with spaces.  I would
like those bytes gone completely not made
into spaces.  Does anyone have a good idea?
I am using DOS, VGA and Borland C++.

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

long filesize(FILE *stream);
void main()
{
  FILE *stream;
  int ctr;
  char in_char;
  int count=0;
  int bytes;

  stream = fopen("DATA.002", "r+");
  if (!stream)
     {cout<<"\n*** Cannot open file ***\n";}

  while (in_char = getc(stream))
    {if (in_char == '\n')
       {count++;}
     else
       {bytes++;}
    if (count==7)      //after 7 lines into the text file
 {goto there;}
    }
there:for (ctr=0; ctr<5; ctr++)
    {
     fseek(stream,0L,SEEK_CUR);
     fprintf (stream,"%c",'\x00');  //this is suppose
                                                   to take away 5
                                                   characters but it
                                                   replaces the 5
                                                   characters with 5
                                                   spaces
    }
return; }