Unify switch case style

I don't have concreate style about switch case but I uses the
following style for now:

    switch (xxx) {
    case aaa:
        a;
        break;
    case bbb: { /* put "{" into the same line */
        b;
        break; /* put break into inside {...} */
    }
    case ccc:
    case ddd: { /* put "{" into the same line
                   even if there are two or more cases */
        ccc;
        ddd;
        break;
    }
    case eee:
        return eee;
        break; /* put break even if return exists */
    default:
        break;
    }