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

//argc holds how many parameters the program received when called
//argv holds their values
int main( int argc , char const *argv[] )
{  
  /* ENSURE THE FILE NAME WAS PASSED */
  if( argc != 2 )                                   //make sure they submitted the file name we are going to copy
  {
    printf( "Please list the file name as a parameter to this program.\n" );
    exit(1);                                        //exit with an error
  }
  
  /* ENSURE THE FILE EXISTS */
  char const* file_name = argv[1];                  //use the filename passed in from the command line
  FILE *fin = fopen( file_name , "r" );             //fin is the file input pointer
  if( !fin )                                        //make sure the file we are reading from exists
  {
    printf( "%s could not be opened.\n" , file_name );
    exit(1); //exit with an error
  }
  
  
  /* EVALUATE THE FILE */
  int total_chars=0 , c;                            //we will store the file's character in c
  for( c=getc(fin)  ;  c != EOF  ;  c=getc(fin) )   //count characters and new lines in the file
    ++total_chars;
  
  
  /* COPY THE FILE'S CONTENTS, WITH NEWLINES TO A CHAR ARRAY */
  rewind(fin);                                      //set the file pointer back to the beginning of the 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
    
  
  /* NOW WRITE EACH CHAR FROM THE QUEUE TO THE FILE */
  fclose(fin);
  FILE *fout = fopen( file_name , "w" );            //open it to overwrite
  for( i=0  ;  i<total_chars  ;  ++i )              //for each char
  {                                                 
    fputc( queue[i] , fout );                       //copy it to the file
    if( queue[i] == '\n' )                          //if it is a newline
      fputc( '\n' , fout );                         //then copy it agian
  }
  fclose(fin);
  
  return 0;
}

Please list the file name as a parameter to this program.