More range aproach, untested written on the fly from mobile phone

import std.stdio : File;

import std.range : chunks;

import.std.algorithm : map, filter, array;

void main()

{

auto r = File("text.txt").byLine

.filter!(a=>a.length)

.chunks(2)

.map!(a=>[a[0].dup, a[1].dup])

.array;

writeln(r);

}