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

int main( )
{
  /* ENSURE THE DATA IS CORRECT */
  char* file_name = "text.dat";
  FILE *fin = fopen( file_name , "r" );      //fin is the file input pointer

  //make sure the file we are reading from exists
  if( !fin )
  {
    printf( "%s could not be opened.\n" , file_name );
    exit(1); //exit with an error
  }


  /* EVALUATE THE FILE */
  int newline_count=0 , char_count=0 , c;  //we will store the file's character in c

  //count characters and new lines in the file
  for( c=getc(fin)  ;  c != EOF  ;  c=getc(fin) )
  {
    ++char_count;
    if( c == '\n' )
      ++newline_count;
  }


  /* COPY THE FILE'S CONTENTS, WITH NEWLINES TO A CHAR ARRAY */
  rewind(fin);                                              //set the file pointer back to the beginning
  const int total_chars = newline_count + char_count;       //number of chars in the new file
  char queue[ total_chars ];                                //we will add all chars to the end of this variable
  int i=0;                                                  //tracks where the end of the queue is

  for( i=0 ; i<total_chars ; ++i )
  {
    queue[i] = getc(fin);     //add the next character in the file to the end of the queue
    if( queue[i] == '\n' )    //if it is a newline, add it again
    {
      ++i;
      queue[i] = '\n';
    }
  }


  /* NOW WRITE EACH FILE FROM THE BUFFER TO THE FILE */
  fclose(fin);
  FILE *fout = fopen( file_name , "w" );  //open it to overwrite
  for( i=0  ;  i<total_chars  ;  ++i )
    fputc( queue[i] , fout );
  fclose(fin);

  return 0;
}