Error Correction Question

Correct following program.

Function filecopy copies a file whose name is srcfn to a file whose name is dstfn. 


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

void filecopy(char *srcfn, char *dstfn)
{
  FILE *sfp,  dfp;
  int   ch;

  if ((sfp = fopen(srcfn, "r")) == NULL) {
     fprintf(stderr, "Error: can't open %s\n", srcfn);
     exit(1);
  }

  if ((dfp = fopen(dstfn, "w")) == NULL) {
     fprintf(stderr, "Error: can't open %s\n", dstfn);
     exit(1);
  }

  while ((ch = fgetc(sfp)) == NULL) {
     fputc(dfp, ch);
  }
}

Result