Small bug on text correction

[ghost]

Hi there, nice project! I really like it. This was my first try and I noticed a small bug regarding text correction. Within my 5 phrases, it was Scaling the server infrastructure for high traffic" and I got that right, but it counted as wrong because as you can see here, there's a double space between high and traffic. This situation also happens in another sentences, such as on the phrase on line 7.

Sadly I didn't take a screenshot to attach. I tried to take a new lesson, but it was only available for tomorrow. Since it's not a relevant change, I didn't feel comfortable enough to open a PR without your knowledge.

EDIT: you made a few changes after I opened this issue, so here's the right link

[arthcc]

thanks for telling me!