Import all this stuff into a single repo called Serenity.

AK/StringBuilder.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "String.h"
+#include "Vector.h"
+
+namespace AK {
+
+class StringBuilder {
+public:
+    StringBuilder() { }
+    ~StringBuilder() { }
+
+    void append(String&&);
+    void append(char);
+
+    String build();
+
+private:
+    Vector<String> m_strings;
+};
+
+}
+
+using AK::StringBuilder;
+