code: private String getFolderAndCreateIfMissing(String inFolder) {
  		String folder = outputFolder;
  		if (inFolder != null) {
  			folder += "/" + inFolder;
  		}
  		mkdirs(folder);
  		return folder;
  	}
docs: Computes foldername and creates the folders that does not already exist
  
  @param inFolder, left out if null
  @return