Using a variable for input and output table in Postgres SQL pl/pgsql

varible_in_out_table.sql

CREATE OR REPLACE FUNCTION query(
   in_tb character varying,
   out_tb character varying
)
RETURNS integer
LANGUAGE plpgsql
AS $function$
BEGIN
EXECUTE
    'CREATE TABLE '
    || out_tb
    || ' AS SELECT * FROM '
    || in_tb
    || ' LIMIT 10';

RETURN 1;
END
$function$;

select query('input_table', 'output_table');