Fixed dialyzer errors

```
  make dialyzer
    Checking whether the PLT is up-to-date... yes
    Proceeding with analysis... done in 0m1.27s
  done (passed successfully)
```

And also fixed some styling issues
Line 87 is too long: "handle_call({interact, Agent}, From, St = #state{sim_params = SP, config = Cf}) ->".