Refactored project structure

backend/handlers/json_helpers.go

@@ -0,0 +1,13 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func writeJSON(w http.ResponseWriter, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(v); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}