update,

task1/utils/getLastRow.js

@@ -0,0 +1,27 @@
+function getLastRow(sheet) {
+  var output = { state: "init", debug: {sheet}, error: "" };
+  try {
+    var last_row = -1;
+    var row_scan = 99999;
+
+    for (let i = 1; i < row_scan; i++) {
+      if (checkLastRow(sheet, i)) {
+        // print last row number
+        last_row = i - 1;
+        output = { ...output, debug: { ...output.debug, last_row } };
+        console.log("last row is " + last_row.toString());
+        break;
+      } else {
+        // keep going
+      }
+    }
+    if (last_row == -1) {
+      throw new Error('cannot find the last row')
+    }
+    return last_row;
+  } catch (error) {
+    console.log('getLastRow error')
+    output = { ...output, error };
+    console.log(output);
+  }
+}