feature: Added remove last emoji ability

Assets/Scripts/Messaging/Composer/InputField.cs

@@ -1,3 +1,4 @@
+using System.Text.RegularExpressions;
 using TMPro;
 using UnityEngine;
 
@@ -12,5 +13,12 @@ namespace Messaging.Composer {
 		public void WriteEmoji(string emoji) {
 			fieldText.text += emoji;
 		}
+
+		private readonly Regex _removeRegex = new(@"<([a-z]+)(?![^>]*\/>)[^>]*>(?!.*<([a-z]+)(?![^>]*\/>)[^>]*>)");
+
+		public void RemoveEmoji() {
+			string newText = _removeRegex.Replace(fieldText.text, "");
+			fieldText.SetText(newText);
+		}
 	}
 }

Assets/Scripts/Messaging/Composer/UndoButton.cs

@@ -0,0 +1,16 @@
+using System;
+using UnityEngine;
+
+namespace Messaging.Composer {
+	public class UndoButton : MonoBehaviour {
+		private InputField _inputField;
+
+		private void Awake() {
+			_inputField = FindObjectOfType<InputField>();
+		}
+
+		public void UndoClick() {
+			_inputField.RemoveEmoji();
+		}
+	}
+}

Assets/Scripts/Messaging/Composer/UndoButton.cs.meta

@@ -0,0 +1,11 @@
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