Help to write the print function

#1
#2

Hey,i have replied in chat.You can see that

#3

https://www.geeksforgeeks.org/tree-traversals-inorder-preorder-and-postorder/#:~:text=In%20case%20of%20binary%20search,nodes%20in%20non-decreasing%20order.&text=Preorder%20traversal%20is%20used%20to,on%20of%20an%20expression%20tree.
You can see all ways of printing tree here

#4

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