How to remove newly created item version if there is no change with previous version in sitecore programmatically

I am creating version of item on lock & edit button. I want to remove that version if author does not change any value of that version while check in version. I would like to compare versions and delete newly created version if there is no change while check in item version.

Note: No workflow is needed

On ItemSaving event you can get the list of changes in the item. Here is some sample code to get the idea:

protected void OnItemSaving(object sender, EventArgs args)
    {
        var newItem = Event.ExtractParameter(args, 0) as Item;
        Item originalItem = newItem.Database.GetItem(newItem.ID, newItem.Language, newItem.Version);
    var differences = FindDifferences(newItem, originalItem);    
} 

private List<string> FindDifferences(Item newItem, Item originalItem)
    {
        newItem.Fields.ReadAll();
        IEnumerable<string> fieldNames = newItem.Fields.Select(f => f.Name);
        return fieldNames
          .Where(fieldName => newItem[fieldName] != originalItem[fieldName])
          .ToList();
    }