Binary Tree Encoding

I recommend three improvements, one major and two minor.The minor one first: Do not pad out with spaces to horizontally align tokens. There's nothing wrong with doing it, it will just end up taking time to keep everything aligned, or you will end up not bothering (because your in a hurry perhaps) and have inconsistent alignment. Secondly, typedef your structure:so you can just use BTnode instead of struct BTnode.The major one: Do not use prototypes when you can use the function/structure itself as the prototype. You can get rid of the whole prototype section in your code. You will need to move bt_node_create up a bit though. This will decrease maintenance time - when you change a function's parameters / return value, you only need to do it once.Oh, and I've just noticed that there appears to be a few C features in your code, so it's not pure C code. UPDATEI've removed the prefixed underscore (I actually do not do that normally). I am not sure about the comment mentioning the namespace thing as C does not have namespaces.As for C features (I am not up to date with the C specification so some of these may be in the latest spec):ANOTHER UPDATEThis is a personal preference, but I like to put the point * next to the symbol without a white space:which, for me, makes it quicker to differentiate between multiplication and pointer dereferences:I know that the context of the above would disambiguate between the two, but that requires extra parsing by my brain of the adjacent code, and the less my brain has to do the better (it is an old brain after all and not as good as the ones these young people on here have ;-) ).

1. Screwed By a tree?

Ouch! It would be pointless to get insurance now... They would not cover it because it is a preexisting condition..... You could get lucky. Good luck and lets be thankful it was just something material that got crushed

2. Make sunspot into Christmas tree

It can be done. The method shortly:Using rectified arc belt as stroke gave the following result:The tree unfortunately cannot be much more complex because the amount of vector objects explodes and you will easily get error "Not enough memory" which halts the program. I also tried to add some decoration with narrower belt and making the belt locally narrower with the path width tool. It was quite far from a sunspot because the arc belt was replaced by something approaching to an ordinary stroke. But this is an artistic problem and beyond the question, which was technical.How to do it:At first your image needed some contrast enhancement (curves) and sharpening (unsharp mask). Obviously you have much better quality images than these screenshots. Black is good to be as deep as possible. Rectifying the arc belt was done with filter Distort > Polar coordinates > Polar to rectilinear. The round sunspot was warped to more circular and placed to the center of the image (=exact square). I added a temporary symmetric pattern for aiming as a separate layer:The white gaps due the warping do not harm because this layer is a duplicate. Applying the polar to rectilinear transform gave a straight belt. It got more sharpening. I used the the lens blur compensation in Filter > Sharpen > Smart Sharpen:The next step was to posterize the image to 32 colors to have an idea how it will look out after tracing to vector. It also simplifies te deletion of unwanted parts. The black area above the top edge was deleted (actually unnecessary)and some stray spots were erased. The bottom edge was cutted coarsely with the eraser. It was not exact, the idea was to remove the yellow sun and retain some of the hairiness of the belt. The result was copied & pasted to Illustrator and traced to 32 colors:The piece of the belt was zoomed to smaller size and dragged to the Brushes collection. A vertically flipped copy was also made because I was not sure of the direction of the paths which will get it. The arcs look better, if their original black ends are on black in the final image. The brush settings:Remove the traced brush shape after creating the brush. It's too easy to accidentally apply the brush to the shape. It has thousands of paths => your machine will be freezed straight away. A very simple tree was drawn. It got black fill and the arc belt brush stroke.There's no decoration (candles, stars, etc...) because the thickness of the arc belt does not allow complex shapes. There's as few anchor points as possible and only smooth ones. Sharp anchors make the belt overlap itself or leave gaps depending on the brush settings.The grainy surface of the sun was taken from your image. A piece was selected with the direct selection tool to get highly irregular edges along grain borders. It was traced to 16 colors in Illustrator and inserted to Symbols collection. The symbol was dragged to the artboard quite many times. To avoid apparent repeating it was used as flipped, rotated and slightly resized.To stay beyond all scientific realism, the things can be also reversed. This version probably stands some ordinary decoration because there's black background. A black rectangle has got a hole in the pathfinder panel (minus).The synthetic arc belt: It was obvious and quite soon proved too, that from the photo derived arc belt is extremely heavy load for my low resource system. I tried to make a synthetic version in Illustrator. In the following image the sun surface is a traced square taken from your photo, but the arc belt is synthetic:1 and 2. A couple of differently colored arcs were drawn. Both have 2 different gradients placed onto a solid colored bar. Blending modes multiply and hard light are used.My judgement: The synthetic arc belt can look out too clean and finally it was not at all lighter load for the computer.This is not tested, but the whole job could be easier in Photoshop. The arc belt could be painted with the pattern stamp. Several versions are needed for different directions and the tight corners must be crafted with special care.Why easier? The result would not kick the computer on its knees like the multi thousand shape Illustrator version. Affinity designer: A PNG image with transparent background can be used just like a pattern brush in Illustrator. It bends very nicely along a path. There's no need to vectorize the image before using it as a brush. The only problem: The brushed stroke is a bitmap and like all bitmaps, it loses sharpness if enlargened.

3. Could the "tree of knowledge of good and evil” mean "tree of intelligence”?

While I believe your question is exciting, I have not seen Etz HaDa'as Tov v'Rah translated in any other way other than "tree of the knowledge of good and evil". Can you supply some sources for considering an alternative translation? You see, literally means, "Tree of knowledge of good and evil". There is no questionable translation there. I guess by stretching it a bit, you could say that everything is either good or evil (such as all NATURAL numbers are either odd or even) and therefore to know good AND evil implies everything