implemented data sources with prisma in go

backend-go/internal/utils/utils.go

@@ -0,0 +1,11 @@
+package utils
+
+// Let applies a function `f` to a pointer value `ptr` if it's not nil.
+// Returns nil if the pointer is nil.
+func Let[T any, R any](ptr *T, f func(T) R) *R {
+	if ptr == nil {
+		return nil
+	}
+	result := f(*ptr)
+	return &result
+}