def format_labels(labels):
    """
    Format labels to be first letter upper case, all other characters lowercase.
    Args:
        labels (list): labels to be formatted

    Returns:
        list: formatted labels

    """
    edited_labels = []
    for label in labels:
        label = label.lower()
        label = label[0].upper() + label[1:]
        label = label.replace(" i ", " I ")
        edited_labels.append(label)
    return edited_labels