NEED THE ANSWER IN 30 mins thank you Write a recursive function find sum that traverses through all nodes in a binary tree and returns the sum of all values as integer, if the tree is empty, the function should return None. Do not use any built-in functions sum. The code for the Tree class, function build tree(), and the main is already written for you. Name your file treesum.py and upload it here. cliss-Iree: 1 eeoerate a tret fros a list of iters (data) def bukld tree(data, index)? t w Mone 14 inder i irn(data): left = bulld_tree (dat= index+2+1) risht = build tree(data, Index+2+2) t= Tree(data[ indes), left; right) 1. recursively traverse through all nodes in a tree and retion the liom Def ifnd sunttree). a your cede goes here 14 \[ \begin{array}{l} \text { fot }=\text { owe on }[1,2,7,4,0,6,5] \\ t=\text { buliomtred(gate, o) } \\ \text { e flnd the sum } \\ 1 \text { o fini_luat }(t) \\ \text { assect i w } 13 \\ \end{array} \] HINTS: Get the node value and add it to the returns of other subtrees. Do not forget to return the sum. NOTE: Please upload your hle treesum.py here..