How did the holy roman empire achieve their empire?

Voltaire said the Holy Roman Empire was not 'Holy, Roman, or an Empire.'

the ottoman empire destroyed the roman empire in war

Yes

The Holy Roman Empire was actually in Germany and was named so by a pope after Charlemagne or Charles the Great conquered most of Europe and became Christan. The Roman Empire, from around 750 BC,...

First of all, despite its name, Holy Roman Empire was not holy, nor Roman, and it wasn't an empire. Rather, it was a loose collection of German states like Prussia, Bavaria, and Hesse. And these...