Function secrets 

fn secrets(words: &Words, subject: &str, body: &str) -> Secrets

Every secret of a message. codes::detect reads the first 6000 characters, the first phrase it knows and the code beside it, and says one kind: so each number that could be a code is asked about with the words around it, in a text where codes printed apart (“4 8 2 9 1 3”) are joined too; and the rest is read piece by piece with every digit blanked, so that a password or a link further on is not hidden behind a code.