How to copy the shape layer contents to another shape layer by scripting

it mean this?

      for (var i = 0; i < Object.keys(contents).length; i++) {
        for (var j = 1; j < contents[Object.keys(contents)[i]].length; j++) {
          deselectAll(comp);
          contents[Object.keys(contents)[i]][j].selected = true;
          app.executeCommand(19);
        }
      }

      var newShapeLayer = comp.layers.addShape();

      for (var i = 0; i < Object.keys(contents).length; i++) {
        var shapeGroup = newShapeLayer.property('ADBE Root Vectors Group').addProperty('ADBE Vector Group')
        shapeGroup.name = Object.keys(contents)[i];
        deselectAll(comp);
        shapeGroup.selected = true;
        app.executeCommand(20);
      }

this will paste only last one copied content

  function shapeMerge() {
    try {
      var comp = app.project.activeItem
      var selectedLayers = comp.selectedLayers;

      var contents = {};
      for (var i = 0; i < selectedLayers.length; i++) {
        var selectedLayer = selectedLayers[i];
        contents[selectedLayer.name] = []
        for (var j = 1; j <= selectedLayer.property("ADBE Root Vectors Group").numProperties; j++) {
          contents[selectedLayer.name][j] = selectedLayer.property("ADBE Root Vectors Group")(j);
        }
      }

      var newShapeLayer = comp.layers.addShape();

      for (var i = 0; i < Object.keys(contents).length; i++) {
        var shapeGroup = newShapeLayer.property('ADBE Root Vectors Group').addProperty('ADBE Vector Group')
        shapeGroup.name = Object.keys(contents)[i];

        for (var j = 1; j < contents[Object.keys(contents)[i]].length; j++) {
          deselectAll(comp);
          contents[Object.keys(contents)[i]][j].selected = true;
          app.executeCommand(19);

          deselectAll(comp);
          shapeGroup.selected = true;
          app.executeCommand(20);
        }
      }

      newShapeLayer.moveBefore(getTopLayer(selectedLayers));

      for (var i = 0; i < selectedLayers.length; i++) {
        var selectedLayer = selectedLayers[i];
        selectedLayer.enabled = false;
      }
    } catch (e) {
      alert(e)
    }
  }

  function deselectAll(theComp) {
    for (var i = 1; i <= theComp.numLayers; i++) {
      theComp.layer(i).selected = false;
    }
    var theProps = theComp.selectedProperties;
    for (var i = 0; i < theProps.length; i++) {
      theProps[i].selected = false;
    }
  }