@Nullable
	default String getDirectoryName() {
		String fileName = getName();
		int directoryIndex = fileName.lastIndexOf('/');
		if (directoryIndex <= 0) return null;
		return fileName.substring(0, directoryIndex);
	}
@return Directory the file resides in.
May be {@code null} for files in the root directory.
recaf-core/src/main/java/software/coley/recaf/info/FileInfo.java