Is toolbar for writing posts gone? Can you remind me syntax for code block? Also as I understand site switched from bbcode to markdown syntax so where can I find all available syntax?

We support both bbcode and markdown. You can do either:

[code language=c]

char *str = "your code here";

[/code]

Or

```c

char *str = "your code here";

```

Ok thanks. Where can I find all available syntax?

We don't have a page for that yet.

For now you can use this for markdown syntax: https://guides.github.com/features/mastering-markdown/