public function getInterfacesNamespaceForEntity(
        string $entityFqn
    ): string {
        $interfacesNamespace = $this->getProjectNamespaceRootFromEntityFqn($entityFqn)
                               . AbstractGenerator::ENTITY_RELATIONS_NAMESPACE
                               . '\\' . $this->getEntitySubNamespace($entityFqn)
                               . '\\Interfaces';

        return $this->tidy($interfacesNamespace);
    }