const findLargestLevel = function(node) {
    //set a variable to hold the largest sum;
    var largestSum = 0;
    //set a variable to hold the current sum
    var currentSum = 0;

  // search the tree
  //check the node, if there's children
    //sum the children values
    //compare with the largest sum
    //if larger, overwrite with the new sum

    return largestSum
    //return the largest sum
};