refactor: use apache commons Hex instead of our own Hexadecimal class

src/main/java/land/chipmunk/chipmunkmod/util/BotValidationUtilities.java

@@ -8,6 +8,7 @@ import land.chipmunk.chipmunkmod.modules.custom_chat.CustomChat;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.network.ClientPlayNetworkHandler;
 import net.minecraft.client.network.ClientPlayerEntity;
+import org.apache.commons.codec.binary.Hex;
 
 import java.math.BigInteger;
 import java.nio.ByteBuffer;
@@ -85,7 +86,7 @@ public class BotValidationUtilities {
             String time = String.valueOf(System.currentTimeMillis() / 5_000);
             String input = client.player.getUuidAsString() + arguments[0] + time + key;
             byte[] hash = md.digest(input.getBytes(StandardCharsets.UTF_8));
-            String stringHash = Hexadecimal.encode(hash).substring(0, 16);
+            String stringHash = new String(Hex.encodeHex(hash)).substring(0, 16);
 
             final boolean shouldSectionSign = CustomChat.INSTANCE.enabled && player.hasPermissionLevel(2) && player.isCreative();
 

src/main/java/land/chipmunk/chipmunkmod/util/Hexadecimal.java

@@ -1,15 +0,0 @@
-package land.chipmunk.chipmunkmod.util;
-
-public interface Hexadecimal {
-    static String encode (byte b) {
-        return "" + Character.forDigit((b >> 4) & 0xF, 16) + Character.forDigit((b & 0xF), 16);
-    }
-
-    static String encode (byte[] array) {
-        StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < array.length; i++) sb.append(encode(array[i]));
-        return sb.toString();
-    }
-
-    // TODO: Decode
-}