Need help generating .wasm file for project

I tried to use this command to compile my code:
"
em++ -std=c++17 -Wall -pedantic -D variant_CONFIG_SELECT_VARIANT=variant_VARIANT_NONSTD -I C:/Jinja2Cpp/install_x64/include -I C:/json/single_include -I C:/boost_1_68_0/ -I C:/Users/Osman/emsdk/emscripten/1.38.18/system/include/ -c currency_converter.cpp -L C:/Jinja2Cpp/install_x64/lib/static/jinja2cpp.lib -L C:/boost_1_68_0/lib64-msvc-14.1/libboost_system-vc141-mt-x64-1_68.lib -lpthread -o currency_converter.js -s WASM=1 -s DISABLE_EXCEPTION_CATCHING=0 -s USE_PTHREADS=1
"
But only got .o file and a .js file; no .wasm file.  What do I have to do for that?  If have to link the .o file into a .wasm file, how should I do that?  What command?

The link for the repository with the source code is the same as before: https://github.com/DragonOsman/currency_converter .  Please help.  Thanks in advance.
[https://avatars0.githubusercontent.com/u/18173932?s=400&v=4]<https://github.com/DragonOsman/currency_converter>

GitHub - DragonOsman/currency_converter: Application for Computer Science course<https://github.com/DragonOsman/currency_converter>
Google Maps + Currency Converter Web Application. Application for Computer Science course. This is a currency converter web application with the frontend and a backend.
github.com