Adds some unfinished changes for improving blacksmith commands

src/main/java/net/knarcraft/blacksmith/util/TabCompletionHelper.java

@@ -0,0 +1,32 @@
+package net.knarcraft.blacksmith.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A helper class for tab complation
+ */
+public final class TabCompletionHelper {
+
+    private TabCompletionHelper() {
+
+    }
+
+    /**
+     * 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;
+    }
+
+}