function addNumSplits(n) {
  if(10 <= n <100) {
    let nArray = Array.from(n.toString()).map(Number);
    console.log("nArray: " + nArray);
    let n1 = nArray[0];
    let n2 = nArray[1];
    let ntotal = n1 + n2;
    console.log("n1: " + n1);
    console.log("n2: " + n2);
    console.log("n1+n2: " + ntotal );
    return ntotal;
  } else {
    // return 0 for total
    return 0;
  }
}