change: refractored and seperated all code into different parts

Backend/helper/system.go

@@ -0,0 +1,18 @@
+package helper
+
+import (
+	"os"
+)
+
+// Returns env with default fallback value.
+//
+// Params:
+//
+//	key - enviroment var name
+//	fallback - default value
+func GetEnv(key, fallback string) string {
+	if value, ok := os.LookupEnv(key); ok {
+		return value
+	}
+	return fallback
+}

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", "*")
+	}
+}