[Nexus]

var str1='1 1\n1 1';
var str2=' 2 3 4\n5 6 7';

var table = [];
[str1, str2].forEach(str => {
    str.split('\n').forEach((row, i) => {
        (table[i] || (table[i] = [])).push(row.trim());
    });
});

console.log(
    table.map(cells => cells.join(' ')).join('\n')
);