part $3$: Write a recursive function that given a sorted tree, returns a list of numbers in ascending order. The instruction for part $3$is:

Part $3$: Write a recursive function tree$-$to$-$list that given a sorted tree, constructs the list of numbers in order.

Test your function with:

$($tree$-$to$-$list $($list$-$to$-$tree $\text{'}(22257168346773217845319)()))$

list$-$to$-$tree should work as defined in the previous $2($part $1$and part $2)$

This should return $\text{'}(34577881617192225323467)$

Tree$-$to$-$list should not call flatten or any sorting function.