how to delete attachment and replace some words in subject

hi, all, I need to filter email as follow rules: 1, delete the attachments; 2, replace some word in subject with code; 3, redirect to other email with the modified subject and original text in body.

sieve and exrprograms used in my script. But error in run sieve script while try to set body text , which contains invalid character "cr lf".

Thanks.

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Best Regards,

Jessica