QUESTION: Fix punctuation: We left the hotel and strolled up Spielbergerstrae It turned out that Milloup had chosen a dead end street
ANS: We left the hotel and strolled up Spielbergerstrae. It turned out, that Milloup had chosen a dead end street.

QUESTION: Fix punctuation: The ondemand tankless water heater as the name implies works without a tank Basically it is a unit containing heating coils
ANS: The on-demand tankless water heater, as the name implies, works without a tank. Basically, it is a unit containing heating coils.

QUESTION: Fix punctuation: Frequency to 200 kHz and duty cycle
ANS: Frequency to 200 kHz and % duty cycle

QUESTION: Fix punctuation: Design your ship and then fly it and shoot the incoming enemies
ANS:
Design your ship and then fly it and shoot the incoming enemies.