charcoal burning to get a second type of coal made from wood

At the moment only bituminous coal is available in the game. It would be nice if charcoal burning could be added to the game.
charcoal burners could turn wood into charcoal which again could be used by other things which needs coal to work like the
coal boilers or the blast furnaces.

We already have coal makers, turning wood into coal.
Note: Turning wood into coal to burn it is less effective than burning woodchips. In fact, it seems that trading wood for corn, turning that info animal feed and burning that is even more effective.

Already in the game, literally the first source of coal you have