Process string by
        -- removing all but letters and numbers
        -- trim whitespace
        -- force to lower case
        if force_ascii == True, force convert to ascii

def full_process(s, force_ascii=False):
    """Process string by
        -- removing all but letters and numbers
        -- trim whitespace
        -- force to lower case
        if force_ascii == True, force convert to ascii"""

    if force_ascii:
        s = asciidammit(s)
    # Keep only Letters and Numbers (see Unicode docs).
    string_out = StringProcessor.replace_non_letters_non_numbers_with_whitespace(s)
    # Force into lowercase.
    string_out = StringProcessor.to_lower_case(string_out)
    # Remove leading and trailing whitespaces.
    string_out = StringProcessor.strip(string_out)
    return string_out