Fixes various bugs in commands

src/main/java/net/knarcraft/paidsigns/utility/TabCompleteHelper.java

@@ -15,6 +15,40 @@ public final class TabCompleteHelper {
 
     }
 
+    /**
+     * Finds tab complete values that contain the typed text
+     *
+     * @param values    <p>The values to filter</p>
+     * @param typedText <p>The text the player has started typing</p>
+     * @return <p>The given string values that contain the player's typed text</p>
+     */
+    public static List<String> filterMatchingContains(List<String> values, String typedText) {
+        List<String> configValues = new ArrayList<>();
+        for (String value : values) {
+            if (value.toLowerCase().contains(typedText.toLowerCase())) {
+                configValues.add(value);
+            }
+        }
+        return configValues;
+    }
+
+    /**
+     * Finds tab complete values that match the start of the typed text
+     *
+     * @param values    <p>The values to filter</p>
+     * @param typedText <p>The text the player has started typing</p>
+     * @return <p>The given string values that start with the player's typed text</p>
+     */
+    public static List<String> filterMatchingStartsWith(List<String> values, String typedText) {
+        List<String> configValues = new ArrayList<>();
+        for (String value : values) {
+            if (value.toLowerCase().startsWith(typedText.toLowerCase())) {
+                configValues.add(value);
+            }
+        }
+        return configValues;
+    }
+
     /**
      * Gets the available boolean values for tab completion
      *
@@ -49,7 +83,7 @@ public final class TabCompleteHelper {
         for (String paidSignName : paidSignNames) {
             quotedNames.add("\"" + paidSignName + "\"");
         }
-        return new ArrayList<>(quotedNames);
+        return quotedNames;
     }
 
     /**