Registry::getVendorExtensionName() 

\nn\t3::Registry()->getVendorExtensionName($combinedVendorPluginName = ''); 

Generate plugin name. Depending on the Typo3 version, the plugin name is returned with or without the vendor.

\nn\t3::Registry()->getVendorExtensionName( 'nncalendar' ); // => Nng.Nncalendar
\nn\t3::Registry()->getVendorExtensionName( 'Nng\Nncalendar' ); // => Nng.Nncalendar
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| @return string

Source Code 

public function getVendorExtensionName( $combinedVendorPluginName = '' )
{
	// Nng als Vendor-Name verwenden, falls nichts angegeben.
	$combinedVendorPluginName = str_replace('\\', '.', $combinedVendorPluginName);
	if (strpos($combinedVendorPluginName, '.') === false) {
		$combinedVendorPluginName = 'Nng.'.$combinedVendorPluginName;
	}
	$parts = explode('.', $combinedVendorPluginName);
	$vendorName = GeneralUtility::underscoredToUpperCamelCase( $parts[0] );
	$pluginName = GeneralUtility::underscoredToUpperCamelCase( $parts[1] );
	$registrationName = "{$pluginName}";
	return $registrationName;
}
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