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

int
main ()
{
  int felder = 10;
  int ignore = 3;
  char *cols[felder];
  size_t n = 0;
  FILE *fp = fopen ("list.txt", "r");
  FILE *fp2 = fopen ("nodup.txt", "a");
  if (fp == NULL)
    {
      perror ("Unable to open file!");
      exit (1);
    }
  char *line2 = NULL;
  size_t len = 0;

  clock_t begin = clock ();

/* here, do your time-consuming job */

  while (getline (&line2, &len, fp) != -1)
    {
      n = 0;
      if (len > felder)
	for (char *p = strtok (line2, ";"); p; p = strtok (NULL, ";"))
	  {
	    if (n < ignore + 1)
	      fprintf (fp2, "%s;", p);
	    else if (n > ignore && n < felder+1)
	      {
		for (int x = n - 1; x > ignore - 1; x--)
		  {
		    if (strcmp (cols[x], p) == 0)
		      break;
		    else if (x < ignore + 1)
		      fprintf (fp2, "%s", p);
		  }
		fprintf (fp2, ";");
	      }
	    cols[n++] = p;
	    if (n > felder - 1)
	      break;
	  }
      fprintf (fp2, "\n");
    }

  clock_t end = clock ();
  double time_spent = (double) (end - begin) / CLOCKS_PER_SEC;
  printf ("%f\n", time_spent);
  return 0;
}