diff --git a/src/cmd/frontend/main.go b/src/cmd/frontend/main.go
index 6de08b3..cd7a50f 100644
--- a/src/cmd/frontend/main.go
+++ b/src/cmd/frontend/main.go
@@ -67,7 +67,7 @@ func main() {
 	// define app
 	webapp := app.NewApp(db)
 
-	// create middle
+	// create middleware
 	stack := middleware.CreateStack(
 		middleware.Logging,
 	)
diff --git a/src/internal/crawler/crawlerfacade.go b/src/internal/crawler/crawlerfacade.go
index 17585a7..6dfba7d 100644
--- a/src/internal/crawler/crawlerfacade.go
+++ b/src/internal/crawler/crawlerfacade.go
@@ -8,62 +8,66 @@ import (
 )
 
 type CrawlerFacade struct {
-    spiegelFeedDistributer *util.Distributer[*model.Article]
-    zeitFeedDistributer *util.Distributer[*model.Article]
+	spiegelFeedDistributer *util.Distributer[*model.Article]
+	zeitFeedDistributer    *util.Distributer[*model.Article]
 }
 
 func (cf *CrawlerFacade) Init() {
-    // init
-    cf.spiegelFeedDistributer = &util.Distributer[*model.Article]{}
-    cf.spiegelFeedDistributer.Init()
-    cf.zeitFeedDistributer = &util.Distributer[*model.Article]{}
-    cf.zeitFeedDistributer.Init()
-    
-    // run spiegel feed
-    sf := &WebFeed{}
-    sf.Init(
-        "https://www.spiegel.de/",
+	// init
+	cf.spiegelFeedDistributer = &util.Distributer[*model.Article]{}
+	cf.spiegelFeedDistributer.Init()
+	cf.zeitFeedDistributer = &util.Distributer[*model.Article]{}
+	cf.zeitFeedDistributer.Init()
+
+	// run spiegel feed
+	sf := &WebFeed{}
+	sf.Init(
+		"https://www.spiegel.de/",
 		colly.AllowedDomains("www.spiegel.de", "spiegel.de"),
 		colly.CacheDir("./persistence/spiegel_cache"),
 		colly.MaxDepth(1),
-    )
-    sf_feed := sf.Feed()
-    sf_converter := ConverterSpiegel{}
-    sf_converter.Init()
+	)
+	sf_feed := sf.Feed()
+	sf_converter := SpiegelConverter{}
+	sf_converter.Init()
 
-    go func() {
-        for val := range sf_feed {
-            article, err := sf_converter.Convert(val)
-            if err != nil { continue }
-            cf.spiegelFeedDistributer.Publish(article)
-        }
-    }()
+	go func() {
+		for val := range sf_feed {
+			article, err := sf_converter.Convert(val)
+			if err != nil {
+				continue
+			}
+			cf.spiegelFeedDistributer.Publish(article)
+		}
+	}()
 
-    // run zeit feed
-    zf := &WebFeed{}
-    zf.Init(
-        "https://www.zeit.de/index",
+	// run zeit feed
+	zf := &WebFeed{}
+	zf.Init(
+		"https://www.zeit.de/index",
 		colly.AllowedDomains("www.zeit.de", "zeit.de"),
 		colly.CacheDir("./persistence/zeit_cache"),
 		colly.MaxDepth(1),
-    )
-    zf_feed := zf.Feed()
-    zf_converter := ZeitConverter{}
-    zf_converter.Init()
+	)
+	zf_feed := zf.Feed()
+	zf_converter := ZeitConverter{}
+	zf_converter.Init()
 
-    go func() {
-        for val := range zf_feed {
-            article, err := zf_converter.Convert(val)
-            if err != nil { continue }
-            cf.zeitFeedDistributer.Publish(article)
-        }
-    }()
+	go func() {
+		for val := range zf_feed {
+			article, err := zf_converter.Convert(val)
+			if err != nil {
+				continue
+			}
+			cf.zeitFeedDistributer.Publish(article)
+		}
+	}()
 }
 
 func (cf *CrawlerFacade) SubscribeToSpiegelFeed(hook func(*model.Article)) {
-    cf.spiegelFeedDistributer.Subscribe(hook)
+	cf.spiegelFeedDistributer.Subscribe(hook)
 }
 
 func (cf *CrawlerFacade) SubscribeToZeitFeed(hook func(*model.Article)) {
-    cf.zeitFeedDistributer.Subscribe(hook)
+	cf.zeitFeedDistributer.Subscribe(hook)
 }
diff --git a/src/internal/crawler/spiegelconverter.go b/src/internal/crawler/spiegelconverter.go
index 0d8240b..99c0c85 100644
--- a/src/internal/crawler/spiegelconverter.go
+++ b/src/internal/crawler/spiegelconverter.go
@@ -10,19 +10,19 @@ import (
 	"github.com/PuerkitoBio/goquery"
 )
 
-type ConverterSpiegel struct {
+type SpiegelConverter struct {
 	pattern_paywall    *regexp.Regexp
 	pattern_url        *regexp.Regexp
 	pattern_whitespace *regexp.Regexp
 }
 
-func (c *ConverterSpiegel) Init() {
+func (c *SpiegelConverter) Init() {
 	c.pattern_paywall = regexp.MustCompile(`"paywall":{"attributes":{"is_active":true`)
 	c.pattern_url = regexp.MustCompile(`^https://(www\.)?spiegel.de.*`)
 	c.pattern_whitespace = regexp.MustCompile(`\s+`)
 }
 
-func (c *ConverterSpiegel) Convert(res *Resource) (*model.Article, error) {
+func (c *SpiegelConverter) Convert(res *Resource) (*model.Article, error) {
 	// check url url pattern
 	if !c.pattern_url.Match([]byte(res.Url)) {
 		return nil, errors.New("invalid url pattern")