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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def convert_to_template(name, kwargs=None, call=None):
    '''
    Convert the specified virtual machine to template.

    CLI Example:

    .. code-block:: bash

        salt-cloud -a convert_to_template vmname
    '''
    if call != 'action':
        raise SaltCloudSystemExit(
            'The convert_to_template action must be called with '
            '-a or --action.'
        )

    vm_ref = salt.utils.vmware.get_mor_by_property(_get_si(), vim.VirtualMachine, name)

    if vm_ref.config.template:
        raise SaltCloudSystemExit(
            '{0} already a template'.format(
                name
            )
        )

    try:
        vm_ref.MarkAsTemplate()
    except Exception as exc:
        log.error(
            'Error while converting VM to template %s: %s',
            name, exc,
            # Show the traceback if the debug logging level is enabled
            exc_info_on_loglevel=logging.DEBUG
        )
        return 'failed to convert to teamplate'

    return '{0} converted to template'.format(name)