class TypeUtils {

    /*
     * Returns the method descriptor (https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.3.3)
     * The method descriptor for the method: {@code Object m(int i, double d, Thread t) {...}}
     * is {@code (IDLjava/lang/Thread;)Ljava/lang/Object;}
     * Note that the internal forms of the binary names of Thread and Object are used.
     */
    public static String getMethodDescriptor(Method method) {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("(");
        for (Class<?> parameter : method.getParameterTypes()) {
            appendDescriptor(parameter, stringBuilder);
        }
        stringBuilder.append(")");
        appendDescriptor(method.getReturnType(), stringBuilder);
        return stringBuilder.toString();
    }

    private static void appendDescriptor(final Class<?> clazz, final StringBuilder stringBuilder) {
        Class<?> currentClass = clazz;
        while (currentClass.isArray()) {
            stringBuilder.append("[");
            currentClass = currentClass.getComponentType();
        }
        if (currentClass.isPrimitive()) {
            String descriptor = getPrimitiveTypeDescriptor(currentClass);
            stringBuilder.append(descriptor);
        } else {
            stringBuilder.append("L").append(currentClass.getName().replace(".", "/")).append(";");
        }
    }

    public static String getPrimitiveTypeDescriptor(final Class<?> clazz) {<FILL_FUNCTION_BODY>}
}

        if (clazz == Void.TYPE || clazz == Void.class) {
            return new VoidType().toDescriptor();
        }
        String className = clazz.getSimpleName();
        Optional<Primitive> prim = Primitive.byTypeName(className);
        if (prim.isPresent()) {
            return prim.get().toDescriptor();
        }
        prim = Primitive.byBoxedTypeName(className);
        return prim.map(pType -> pType.toDescriptor())
                .orElseThrow(
                        () -> new IllegalArgumentException(String.format("Unknown primitive type \"%s\"", className)));
    
<no_super_class>