Build does not work

`make` results with:
```
error[E0432]: unresolved import `bindings::counter::Counter`
 --> app/src/main.rs:1:5
  |
1 | use bindings::counter::Counter;
  |     ^^^^^^^^^^^^^^^^^^^-------
  |     |                  |
  |     |                  help: a similar name exists in the module (notice the capitalization): `counter`
  |     no `Counter` in `counter`
```