Check statement correctness on compile (#104)

* Check statement correctness on compile

* format

* Update src/frontend/mod.rs

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* clean error handling

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* clean coding style

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* don't need to return ()

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* Update github workflow for mdbook

* Resolve issue from merge: pass params to check()

---------

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

.github/workflows/mdbook-check.yml

@@ -21,6 +21,7 @@ jobs:
         run: |
           curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf -y | sh
           rustup update
+          rustup toolchain install nightly-x86_64-unknown-linux-gnu
           cargo install --version ${MDBOOK_VERSION} mdbook
           cargo install --version ${MDBOOKKATEX_VERSION} mdbook-katex
       - name: Build with mdBook