ALTERED CODE - ORIGINAL BELOW

#include <stdio.h>

int copyfile(char *source,char *dest) {
  FILE *sourceFile;
  FILE *destinationFile;
  char *buffer;
  int n;

  printf(source);
  printf("\n");
  printf(dest);

  sourceFile = fopen(source, "r");
  destinationFile = fopen(dest, "w");

  if(sourceFile==NULL) {
    printf("Error: can't access file.c.\n");
    return 1;
  }
  else if(destinationFile==NULL) {
    printf("Error: can't create file for writing.\n");
    return 1;
  }
  else {
    n = fread(buffer, 1, 1000, sourceFile); /* grab all the text */
    fwrite(buffer, 1, n, destinationFile);  /* put it in file2.c */
    fclose(sourceFile);
    fclose(destinationFile);

    destinationFile = fopen(dest, "r");
    n = fread(buffer, 1, 1000, destinationFile); /* read file2.c   */
    printf("%s", buffer);                        /* display it all */

    fclose(destinationFile);
    return 0;
  }
}

int main(void) {
    copyfile("file.c","file2.c");
}

ORIGINAL

#include <stdio.h>

int main() {
  FILE *sourceFile;
  FILE *destinationFile;
  char *buffer;
  int n;

  sourceFile = fopen("file.c", "r");
  destinationFile = fopen("file2.c", "w");

  if(sourceFile==NULL) {
    printf("Error: can't access file.c.\n");
    return 1;
  }
  else if(destinationFile==NULL) {
    printf("Error: can't create file for writing.\n");
    return 1;
  }
  else {
    n = fread(buffer, 1, 1000, sourceFile); /* grab all the text */
    fwrite(buffer, 1, n, destinationFile);  /* put it in file2.c */
    fclose(sourceFile);
    fclose(destinationFile);

    destinationFile = fopen("file2.c", "r");
    n = fread(buffer, 1, 1000, destinationFile); /* read file2.c   */
    printf("%s", buffer);                        /* display it all */

    fclose(destinationFile);
    return 0;
  }
}