def METHOD_NAME(metadata):
    """Convert metadata to quickstatements.
    Convert metadata about a ArXiv article represented in a dict to a
    format so it can copy and pasted into Magnus Manske quickstatement web tool
    to populate Wikidata.
    This function does not check whether the item already exists.
    Parameters
    ----------
    metadata : dict
        Dictionary with metadata.
    Returns
    -------
    quickstatements : str
        String with quickstatements.
    References
    ----------
    - https://wikidata-todo.toolforge.org/quick_statements.php
    """
    qs = u"CREATE\n"
    qs += u'LAST\tP31\tQ13442814\n'
    # arXiv ID
    qs += u'LAST\tP818\t"{}"'.format(metadata['arxiv'])
    # No line break, to accommodate the following qualifiers
    # arXiv classifications such as "cs.LG", as qualifier to arXiv ID
    for classification in metadata['arxiv_classifications']:
        qs += u'\tP820\t"{}"'.format(
            classification.replace('"', '\"'))
    # Line break for the P818 statement
    qs += u"\n"
    qs += u'LAST\tLen\t"{}"\n'.format(metadata['title'].replace('"', '\"'))
    qs += u'LAST\tP1476\ten:"{}"\n'.format(
        metadata['title'].replace('"', '\"'))
    qs += u'LAST\tP577\t+{}T00:00:00Z/11\n'.format(
        metadata['publication_date'][:10])
    qs += u'LAST\tP953\t"{}"\n'.format(
        metadata['full_text_url'].replace('"', '\"'))
    # Optional DOI
    if 'doi' in metadata:
        qs += u'LAST\tP356\t"{}"\n'.format(
            metadata['doi'].replace('"', '\"'))
    # DOI based on arXiv identifier
    qs += u'LAST\tP356\t"10.48550/ARXIV.{}"\n'.format(
            metadata['arxiv'])
    for n, authorname in enumerate(metadata['authornames'], start=1):
        qs += u'LAST\tP2093\t"{}"\tP1545\t"{}"\n'.format(
            authorname.replace('"', '\"'), n)
    return qs