Prius c 2015 doesn’t spin the engine

Usually that means the hybrid battery (the big one) has been discharged below the lower limit.

You can attempt to recharge it yourself- if you are okay working with high voltage and understand how to modify electronics.

If you're going to get anywhere with that car, start by getting a diagnostic scanner that can talk to each and every system in there. I recommend the Autel AP2500E, and I have heard good things about the very similar model AP200.

This link will tell you how to get a subscription to the actual factory repair manual.

 

If you hear the sound of MG1 spinning (and you're sure that's the sound you're hearing, say if you have a scan tool showing live data and it shows >0 MG1 RPM then) but the crankshaft doesn't move when MG1 does, something is busted in the transmission or bellhousing.