foobar

index.css

/*bug-in-github-api-content-can-not-be-empty*/

index.html

/*bug-in-github-api-content-can-not-be-empty*/

index.js

var output = "endrtednedd:/os....cp.rnnn.rhhps/.tt$sfeaiaaofd.ow.otooapa.asu./thhse";

var col = output.split('');
col.sort();
col.push(col.shift());

var table = output.split('');
for (var i = table.length-1; i >= 0; --i) {
	table[i] += col[i];
}

var used = Array(table.length);
for (var i=1; i < output.length-1; ++i) {
	used.fill(false);
	for (var j=0; j < table.length; ++j) {
		table[j] += nextChar(j, i);
	}
}
console.log(table);

function nextChar(index, width) {
	for (var i=0; i < table.length; ++i) {
		match:
		if (!used[i]) {
			for (var j=0; j < width; ++j) {
				if (table[i][j] != table[index][j+1]) {
					break match;
				}
			}
			used[i] = true;
			return table[i][width];
		}
	}
}

jsGist.json

{"name":"foobar","settings":{},"filenames":["index.html","index.css","index.js"]}