Function detect_clone_pairs 

pub fn detect_clone_pairs(
    methods: &[MethodFingerprint],
    threshold: f64,
    n: usize,
) -> Vec<ClonePair>

Detect clone pairs among methods by n-gram Jaccard similarity. O(n²) over the method list — caller is responsible for capping graph size (the Python reference skips graphs above 500 nodes).