missing rename on copy/paste

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
static concat()

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
generalize Handle

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
Handle tests

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>