A procedure to Reverse a String in PL/SQL

Question

I just started learning PL/SQL and I\'m not sure how to create a procedure. The logic seems about right but I think there\'s some syntactical mistake in the first line. Here

Answer 1

 declare
 name varchar2(20):='&name';
 rname varchar2(20);
 begin
 for i in reverse 1..length(name)
 loop
 rname:=rname||substr(name,i,1);
 end loop;
 display(rname);
 end;