my-links/src/lib/link/getUserLink.ts

import { Link, User } from "@prisma/client";
import prisma from "utils/prisma";

export default async function getUserLink(user: User, id: Link["id"]) {
  return await prisma.link.findFirst({
    where: {
      id,
      authorId: user.id,
    },
    include: {
      category: true,
    },
  });
}