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

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/guilds/guild_icon_url.ts

@@ -0,0 +1,15 @@
+import { Guild } from "../../structures/mod.ts";
+import { ImageFormats, ImageSize } from "../../types/mod.ts";
+import { endpoints } from "../../util/constants.ts";
+import { formatImageURL } from "../../util/utils.ts";
+
+/** The full URL of the icon from Discords CDN. Undefined when no icon is set. */
+export function guildIconURL(
+  guild: Guild,
+  size: ImageSize = 128,
+  format?: ImageFormats,
+) {
+  return guild.icon
+    ? formatImageURL(endpoints.GUILD_ICON(guild.id, guild.icon), size, format)
+    : undefined;
+}