Process libFuzzer tree corpus directory

[Avgor46]

We should look into the problem where we have a libFuzzer tree corpus directory with repeating filenames. Is this possible and what should we do with duplicate filenames?

[SweetVishnya]

We may do something similar when there are subdirectories in corpus:

casr/casr/src/bin/casr-ubsan.rs

Lines 169 to 182 in 0faf10b

	let dir_name = input.parent().unwrap().file_name().unwrap();
	let input_name = input.file_name().unwrap();
	let crashline = report.crashline;
	let crashline = crashline.split('/').last().unwrap();
	let crashline = crashline.replace(':', "_");
	// Copy input
	let mut input_path = PathBuf::new();
	input_path.push(output_dir);
	input_path.push(format!(
	"{}_{}",
	dir_name.to_str().unwrap(),
	input_name.to_str().unwrap()
	));

[SweetVishnya]

I just realized that I was wrong -- libFuzzer crash directory is always flat