Method jaccard

atomic-cli/src/commands/diff/helpers.rs:426–437

(a: &HashSet<(u8, u8)>, b: &HashSet<(u8, u8)>)

        }

        fn jaccard(a: &HashSet<(u8, u8)>, b: &HashSet<(u8, u8)>) -> f64 {
            if a.is_empty() && b.is_empty() {
                return 0.0;
            }
            let inter = a.intersection(b).count();
            let union = a.union(b).count();
            if union == 0 {
                0.0
            } else {
                inter as f64 / union as f64
            }
        }

        // 1. Collect all Removed and Added lines with their original indices
        let mut rm_entries: Vec<(usize, &HunkLine)> = Vec::new();