Runnig my model On my Zephyr-based Nordic Semiconductor development board

Is here an example-standalone-inferencing-zephyr](GitHub - edgeimpulse/example-standalone-inferencing-zephyr)
with a .c code source not .cpp?

We do not support C, as all of the underlying code (e.g. TensorFlow Lite for Microcontrollers) is built with C++. You can make function calls to our library using C (see here), but you will still need a C++ compiler to compile the code.