Added discord emoji handling

This will be useful if I decide to add and use custom emojis to the bot

src/enums/emojis.rs

@@ -0,0 +1,63 @@
+/// Discord emojis are sent like this:
+///
+/// `<EmojiName:EmojiId>`
+///
+/// This macro aims to simplify the process by writing the display implementor like this:
+///
+/// ```rust
+/// use serenity_discord_bot::display_emoji_impl;
+///
+/// pub enum Emojis {
+///     EmojiOne,
+///     EmojiTwo,
+/// }
+///
+/// display_emoji_impl! {
+///     Emojis {
+///         EmojiOne => "123456789",
+///         EmojiTwo => "987654321",
+///     }
+/// }
+///
+/// assert_eq!(Emojis::EmojiOne.to_string(), "<:EmojiOne:123456789>".to_string());
+/// assert_eq!(Emojis::EmojiTwo.to_string(), "<:EmojiTwo:987654321>".to_string());
+/// ```
+#[macro_export]
+macro_rules! display_emoji_impl {
+    ($enum_name:ident { $($variant:ident => $id:expr),* $(,)? }) => {
+        impl std::fmt::Display for $enum_name {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                match self {
+                    $(
+                        Self::$variant => {
+                            write!(
+                                f,
+                                concat!(
+                                    "<:",
+                                    stringify!($variant),
+                                    ":",
+                                    $id,
+                                    ">"
+                                )
+                            )
+                        }
+                    )*
+                }
+            }
+        }
+    };
+}
+
+/// NOTE: This allows non-PascalCase because the emoji itself could have a non-PascalCase name. I'd
+/// still try to have them all be PascalCase though.
+#[allow(non_camel_case_types)]
+#[allow(dead_code)]
+pub enum Emojis {
+    HuTaoHeh,
+}
+
+display_emoji_impl! {
+    Emojis {
+        HuTaoHeh => "1317920658021290097",
+    }
+}

src/enums/mod.rs

@@ -1,2 +1,3 @@
 pub mod command_enums;
+pub mod emojis;
 pub mod schemas;

src/event_handler/handler.rs

@@ -12,8 +12,7 @@ use crate::{
         command_data::{Data, Error},
         database::DATABASE_FILENAME,
     },
-    database::connect_to_db,
-    database::level_system::*,
+    database::{connect_to_db, level_system::*},
     utils::{replies::handle_replies, string_manipulation::remove_emojis_and_embeds_from_str},
 };
 use poise::serenity_prelude as serenity;