Creating bucket based on file disk

This code we can use to create some bucket based on file disk. In case you dont have to much memory ram to take care Hashtable. (-:

int writeFileBucket(unsigned int hash, char *keyword)
{
  FILE *bucketWrite = NULL;
  char temp[30]        = "";
  char *file;
  file                 = malloc(100);
  strcpy(file,"bucket");
  sprintf(temp,"%d",hash);
  strcat(file,temp);
  char buffer[500];
  strcpy(buffer,keyword);
  size_t len = 0;
  //try to open file to append
  bucketWrite = fopen(file,"a");
  if (bucketWrite==NULL)        // some problem to create file on disk system
  {
          printf("\n Proble to create bucketFile: %s",file);
            return -1;
  }
  else {
      strcat(buffer," ");                   
      len = strlen(buffer);                   
      fwrite(buffer, len, 1, bucketWrite);
      fclose(bucketWrite);
      return 0;
  }
  free(file);
}