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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/templates/edit_guild_template.ts

@@ -0,0 +1,32 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { structures } from "../../structures/mod.ts";
+import { EditGuildTemplate, GuildTemplate } from "../../types/mod.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotGuildPermissions } from "../../util/permissions.ts";
+
+/**
+ * Edit a template's metadata.
+ * Requires the `MANAGE_GUILD` permission.
+ */
+export async function editGuildTemplate(
+  guildID: string,
+  templateCode: string,
+  data: EditGuildTemplate,
+) {
+  await requireBotGuildPermissions(guildID, ["MANAGE_GUILD"]);
+
+  if (data.name?.length && (data.name.length < 1 || data.name.length > 100)) {
+    throw new Error("The name can only be in between 1-100 characters.");
+  }
+
+  if (data.description?.length && data.description.length > 120) {
+    throw new Error("The description can only be in between 0-120 characters.");
+  }
+
+  const template = (await RequestManager.patch(
+    `${endpoints.GUILD_TEMPLATES(guildID)}/${templateCode}`,
+    data,
+  )) as GuildTemplate;
+
+  return structures.createTemplateStruct(template);
+}