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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 create_disk(name, size):
    '''
    Create a VMM disk with the specified `name` and `size`.

    size:
        Size in megabytes, or use a specifier such as M, G, T.

    CLI Example:

    .. code-block:: bash

        salt '*' vmctl.create_disk /path/to/disk.img size=10G
    '''
    ret = False
    cmd = 'vmctl create {0} -s {1}'.format(name, size)

    result = __salt__['cmd.run_all'](cmd,
                                     output_loglevel='trace',
                                     python_shell=False)

    if result['retcode'] == 0:
        ret = True
    else:
        raise CommandExecutionError(
            'Problem encountered creating disk image',
            info={'errors': [result['stderr']], 'changes': ret}
        )

    return ret