I had time to look up this dynamic memory allocation thing and this was the main problem and I had a tiny logical too. I fixed everything and I passed all the tests. Thanks for your help!

@kissgellert6 So I haven't actually checked if there are logical errors (it looks fine generally, I think), but the first thing that stands out to me here is that you appear to be returning p, which is a pointer to an array defined in your function. This is generally a bad idea, since arrays are stored in the stack. Basically, the array p is pointing to is in "temporary" memory, which could be cleared or reused after the function returns. You can avoid this issue by instead allocating space on the heap using malloc or calloc. The resources I linked are just randomly selected from google, but if you have a book you're working from, it probably has a chapter on this.

Just for example, you have the line

char answer[250]={0}; // answer points to 250 bytes on the stack

I suspect you'll have different results by simply changing that to

char *answer = malloc(250); // answer points to 250 bytes of writable memory on the heap
// or
// char *answer = calloc(250, sizeof(char));

Also, you can mark code blocks using three backticks (ex: ``` some code ``` ), which makes things more readable.

@kissgellert6 Can you be more specific about what didn't work? If you want, you can post your solution I can take a look at it.

I have just startred learning programming recently and I'm not sure what I need to return here. Because I tried to return a pointer which has the address of the first element of the string but it didn't work. (I put '\0' at end of the string) Could you help me?

Approved

can anyone translate to java please?

Indeed, trailing zeros shouldn't be counted.
I've made it clearer in the description.
If they were counted, the fixed length would proably be 32 or 64 though, and I think it's overkill.

Approved.

Approved.

Groovy translation kumited. Please, review and approve. Regards, suic

Python translation

Thank you, correction has been made.