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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/channels/swap_channels.ts

@@ -0,0 +1,20 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { PositionSwap } from "../../types/mod.ts";
+import { endpoints } from "../../util/constants.ts";
+
+/** Modify the positions of channels on the guild. Requires MANAGE_CHANNELS permisison. */
+export async function swapChannels(
+  guildID: string,
+  channelPositions: PositionSwap[],
+) {
+  if (channelPositions.length < 2) {
+    throw "You must provide at least two channels to be swapped.";
+  }
+
+  const result = await RequestManager.patch(
+    endpoints.GUILD_CHANNELS(guildID),
+    channelPositions,
+  );
+
+  return result;
+}