create one function to let other user execute vacuum command. got such an error.

create one function to let other user execute vacuum command. got such an
error. Please help. Thanks. Regards . Grace

rrp=> create function vacuum_f ( tablename char(100))
 Returns char(100) AS $$
vacuum tablename;
$$ Language plpgsql security definer;
ERROR:  syntax error at or near "vacuum"
LINE 3:   vacuum tablename;
          ^
rrp=>

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