Rename `initialize` function to `_initialize`
Rename `initialize` function to `_initialize`

Since we removed the need to call the `initialize` function in the
previous patch, we can make it private.

Signed-off-by: Pang Yan Han <9d8a3bce71455786d192cd4b985538c54e03f109@viki.com>

viki-org/viki-fabric-helpers,viki-org/viki-fabric-helpers