text: #include <fs.h>
  void write_cluster(int cluster_number, char *str)
  {
  	int cluster_position = cluster_number * cluster_size;
  	char *ptr = (char *)(int)clusters + cluster_position;
  	for (int i = 0; i < cluster_size; i++)
  		ptr[i] = str[i];
  }
  char *read_cluster(int cluster_number)
  {
  	int cluster_position = cluster_number * cluster_size;
  	char *ptr = (char *)(int)clusters + cluster_position;
  	return ptr;
  }