tree implement#12

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hebert87 wants to merge 4 commits intogrc-220-s25:mainfrom

Commits on May 21, 2025

added nodes to the tree
Jessica H
committed

Commits on May 22, 2025

finished live code
Jessica H
committed

Commits on May 28, 2025

added a sum method that sums the whole tree
Jessica H
committed
added a sum method that sums the odd numbers
Jessica H
committed