Add method to remove string at start

A new method `removeStringAtStart` has been added to the `ModifiableString` class. It replaces the starting string in a given text. Also, a condition has been modified in the `ChatListener` class to invoke this new method when the input string starts with the `APRIL_FOOLS_RESET` string. Additional unit tests were created to validate these changes.

api/src/main/java/com/alttd/chat/objects/ModifiableString.java

@@ -61,4 +61,8 @@ public class ModifiableString {
                     return list;
                 }));
     }
+
+    public void removeStringAtStart(String s) {
+        text = text.replaceText(TextReplacementConfig.builder().match("^" + s).replacement("").build());
+    }
 }

api/src/test/java/ReverseTest.java

@@ -1,3 +1,4 @@
+import com.alttd.chat.config.Config;
 import com.alttd.chat.objects.ModifiableString;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
@@ -20,6 +21,31 @@ public class ReverseTest {
         assertEquals(expectedOutput, modifiableString.string());
     }
 
+    @Test
+    public void testRemoveKeyword() {
+        String input = "Hello how are you doing today?";
+        MiniMessage miniMessage = MiniMessage.miniMessage();
+
+        ModifiableString modifiableString = new ModifiableString(miniMessage.deserialize(Config.APRIL_FOOLS_RESET + " " + input));
+        modifiableString.removeStringAtStart(Config.APRIL_FOOLS_RESET + " ");
+
+        assertEquals(input, modifiableString.string());
+    }
+
+    @Test
+    public void testRemoveKeywordWithTags() {
+        MiniMessage miniMessage = MiniMessage.miniMessage();
+        String input = "<blue>" + Config.APRIL_FOOLS_RESET + " <red>Hello how are</red> you <blue>doing today</blue>?</blue>";
+        String expectedOutput = "Hello how are you doing today?";
+        Component deserialize = miniMessage.deserialize(input);
+
+        ModifiableString modifiableString = new ModifiableString(deserialize);
+        modifiableString.removeStringAtStart(Config.APRIL_FOOLS_RESET + " ");
+
+        assertEquals(expectedOutput, modifiableString.string());
+    }
+
+
     @Test
     public void testReverseStringWithTags() {
         String input = "<red>Hello how are</red> you <blue>doing today</blue>?";