change: refractored and seperated all code into different parts

Backend/helper/web.go

@@ -0,0 +1,17 @@
+package helper
+
+import (
+	"net/http"
+	"os"
+)
+
+// setting cors, important for later frontend use
+//
+// in DEBUG == "true" everything is set to "*" so that no cors errors will be happen
+func SetCors(w http.ResponseWriter) {
+	if os.Getenv("DEBUG") == "true" {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "*")
+		w.Header().Set("Access-Control-Allow-Headers", "*")
+	}
+}