function handleNewItemSubmit() {
  // this function will be responsible for when users add a new shopping list item
  //1) Check to see if the item is already included in the list

  //  2) if true, then add the item to the list

  //  3) and call render the shopping list again
}

function handleItemCheckClicked() {
  // this function will be responsible for when users click the "check" button on
  // a shopping list item.
  //1) Acess the list element selected and toggle or switch the state of it being "checked"
}

function handleDeleteItemClicked() {
  // this function will be responsible for when users want to delete a shopping list
  // item
  //1) Check to see if the item is included in the list

  //2)    if true, then delete the item from the list

  //3)    and call render the shopping list again
}