HP_ErrorCode HP_CreateFile(const char *filename) {
  //insert code here
  //stages : CREATE , OPEN , INIT , ALLOCATE , SET DIRTY , UNPIN , CLOSE
  int fd;
  printf("call open file\n");
  CALL_BF(BF_CreateFile(filename));
  CALL_BF(BF_OpenFile(filename , &fd));
  printf("call open file end \n");

  printf("lets create a block\n");
  BF_Block *block ; //Ορίζω ένα block.

  printf("lets init block\n");
  BF_Block_Init(&block);
  printf("block initialized\n");
  printf("lets allocate memory\n");
  CALL_BF(BF_AllocateBlock(fd,block)); //δημιουργώ χώρο στο μπλοκ
  printf("memory allocated\n");

  printf("lets get data\n");
  char* d = BF_Block_GetData(block);
  printf("bf get data end\n");
  //memset (d , 'h', sizeof('h'));
  * d='h' ;
  printf("this is a %seap file\n" ,d);

  printf("lets set the block dirty\n");
  BF_Block_SetDirty(block);
  printf("block setdirty end\n");

  printf("lets unpin the block\n");
  CALL_BF(BF_UnpinBlock(block));
  printf("block unpin end\n");

  printf("lets close file\n");
  CALL_BF(BF_CloseFile(fd));
  printf("close file end\n");
  return HP_OK;
}