Thread: Project Euler 22

I'm having a bit of an issue with my solution to Euler problem 22. I have a list of names that are surrounded by quotation makes and separated by commas (I.E. "MARY",). I have created a function (called format) which removes the quotation marks and commas and builds a new array with the names, delimiting them with line feeds (I.E. MARY\n). When I try printing this list with puts(), I get a formatted list as expected, but at the end all of the unformatted names also appear. Obviously, I would like to have only the formatted list returned. If anybody could offer some advice, I would be obliged.

Code:

/* Project Euler problem 22
 *
 * http://projecteuler.net/problem=22
 */

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

#define MAX_NAMES	6000

void alpha_sort(char *buff)
{
	const char alpha[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	char *p;
	int i;

	// array of char pointers
	char *names[MAX_NAMES];
	/*names[0] = "test";*/
	/*p = names[0];*/
	/*printf("%c\n", p[0]);*/


}

char *format(char *buff)
{
	int i = 1, j = 0;
	char *p;
      	p = malloc(sizeof(buff));

	while(buff[i] != '\0') 
	{
		if(isalpha(buff[i]))
		{
			p[j] = buff[i];
			j++;
			i++;
		}

		else
		{
 			p[j] = '\n';
			j++;
			do
			{
				i++;
			} while ( (isalpha(buff[i]) == 0) && (buff[i] != '\0') );
		}
	}

	free(buff);

	return p;
}


char *rfile(void)
{
	long size = 0;
	FILE *fp;
	fp = fopen("names.txt", "r");
	fseek(fp, 0, SEEK_END);
	size = ftell(fp);

	// allocate memory size of file
	char *buff = (char*) malloc(sizeof(char) * size);

	rewind(fp);
	fread(buff, 1, size, fp);
	fclose(fp);

	return buff;
}

int main(void)
{
	char *p = format(rfile());
	puts(p);

	alpha_sort(p);

	return 0;
}