Function deencode 

pub fn deencode(
    input: &str,
    engines: &[&dyn Engine],
    encoding_depth: usize,
) -> DeencodeTree

Build a DeencodeTree by successively running encodings and decodings through the engines.

Alias of DeencodeTree::deencode().

encoding_depth specifies the number of encoding steps, which are always followed by a decoding step, so the actual depth of the generated tree is 2 * encoding_depth.

The process starts with encoding, so you may not have depth == 0. (see EncodeNode::make_nodes()’s documentation)

The order of the engines matters for DeencodeTree::deduplicate().