CS50 recover Pset4 does not pass check50 - c

Question

This program is designed to recover images from a digital camera SD card. The program is not passing the last three checks when I run it through check50. The program does not recover 000.jpg, middle image, and image 049.jpg. The error message indicated the program timed out while waiting for program to exit. The debugging tool has not been able to help me with this. Thank you for your help.
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
// Buffer to store card data
// recover deleter images
int main(int argc, char *argv[])
{
// count is 2
if(argc < 2)
{
printf("usage: ./recover image.raw\n");
return 1;
}
// Read file
char *file = argv[1];
FILE *card = fopen(file, "r");
unsigned char* buffer = malloc(512);
// Check that file is valid
if (fopen(file, "r") == NULL)
{
printf("could not open %s.\n", file);
return 1;
}
char* filename = malloc(3 * sizeof(int));
//JPGs created
int img_count = 0;
int test_counter = 0;
FILE *img nodd= NULL;
// Read 512 chars
while (test_counter == 0)
{
fread(buffer, sizeof(char), 512, card);
// Detect JPEG
if(buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && buffer[3] && 0xf0 == 0xe0)
{
// Write JPEG
sprintf(filename, "%0x3i.jpg", img_count);
img = fopen(filename, "w");
img_count++;
while (true)
{
fread(buffer, sizeof(char), 512, card);
if(buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && buffer[3] && 0xf0 == 0xe0)
{
sprintf(filename, "%0x3i.jpg", img_count);
img = fopen(filename, "a");
img_count++;
test_counter++;
fwrite(buffer, sizeof(char), 512, img);
break;
}
else
{
fwrite(buffer, sizeof(char), 512, img);
break;
}
}
while (fread(buffer, sizeof(char), 512, card)!= 0)
if(buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && buffer[3] && 0xf0 == 0xe0)
{
// Pointer for JPG created
fclose(img);
sprintf(filename, "%0x3i.jpg", img_count);
img = fopen(filename, "a");
img_count++;
}
fwrite(buffer, sizeof(char), 512, img);
}
}
free(buffer);
fclose(img);
return 0;
}