refactor(helpers): separate functions into files (#667)

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/members/edit_bot_nickname.ts

@@ -0,0 +1,18 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotGuildPermissions } from "../../util/permissions.ts";
+
+/** Edit the nickname of the bot in this guild */
+export async function editBotNickname(
+  guildID: string,
+  nickname: string | null,
+) {
+  await requireBotGuildPermissions(guildID, ["CHANGE_NICKNAME"]);
+
+  const response = await RequestManager.patch(
+    endpoints.USER_NICK(guildID),
+    { nick: nickname },
+  ) as { nick: string };
+
+  return response.nick;
+}