Moved everything out of internal

api/urlbuilders/gallery.go

@@ -0,0 +1,19 @@
+package urlbuilders
+
+import "strconv"
+
+type galleryURLBuilder struct {
+	BaseURL string
+	GalleryID string
+}
+
+func NewGalleryURLBuilder(baseURL string, galleryID int) galleryURLBuilder {
+	return galleryURLBuilder{
+		BaseURL: baseURL,
+		GalleryID: strconv.Itoa(galleryID),
+	}
+}
+
+func (b galleryURLBuilder) GetGalleryImageUrl(fileIndex int) string {
+	return b.BaseURL + "/gallery/" + b.GalleryID + "/" + strconv.Itoa(fileIndex)
+}