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  1. or download this
    my $str = out1();
my $ref = out2();
my $str = fun1($str);
my $ref = fun2(\$str);
  2. or download this
    my $str = out1();
my $str = ${ out2() };
my $str = fun1($str);
my $str = ${ fun2(\$str) };
  3. or download this
    my $ref = \out1();
my $ref = out2();
my $ref = \fun1($str);
my $ref = fun2(\$str);