Enumeration Correction in C-Interface

Following issue #144.
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Sine you need to test a problem with wrong number of resource groups I would use something like

```

# My API

# Group A
## Resource A1
### GET
+ Response 200
    
        A1

# Group B
## Resource B1
### GET
+ Response 200

        B1

## Resource B2
### GET
+ Response 200

        B2
```

The core of the test should be that there are two items (groups) returned in `sc_resource_groups_collection_size`.