Hey Wissal, 4 years later, here is your answer: because we need to add the last empty character ('\0') so that it doesn't stray, cause overflow and keep overwriting with anything

both Alterra and TylerBlue are correct

a string "Hello" is actually "Hello!\0" even though that character is not visible

When none of cases match the value stored in str[i], the default is executed instead. So in this code when str[i] is not a vowel, by default it is added to *ans.

Great Code Bro

Probably because ChatGPT was trained on code like this. This solution is from March 2019 so it predated publicly available ChatGPT by a few years.

look like ChatGPT's answer

Some like to cast malloc()'s result, some don't. It's a matter of taste, I guess. See e.g. https://en.wikipedia.org/wiki/C_dynamic_memory_allocation#Type_safety

Thanks!

Can someome please explain me why cant I do the assignment like this : ans[i] = str[i]; ?
Thanx