diff --git a/src/ringo/math.rs b/src/ringo/math.rs
index b2dfa31..4974a69 100644
--- a/src/ringo/math.rs
+++ b/src/ringo/math.rs
@@ -1 +1 @@
-pub mod similarity;
\ No newline at end of file
+pub mod similarity;
diff --git a/src/ringo/math/similarity/tanimoto.rs b/src/ringo/math/similarity/tanimoto.rs
index a224cb6..33480df 100644
--- a/src/ringo/math/similarity/tanimoto.rs
+++ b/src/ringo/math/similarity/tanimoto.rs
@@ -3,13 +3,14 @@ use fixedbitset::FixedBitSet;
 pub fn tanimoto_bitset(a: &FixedBitSet, b: &FixedBitSet) -> f32 {
     let mut and_ = a.clone();
     and_.intersect_with(b);
-    return and_.count_ones(..) as f32 / (a.count_ones(..) + b.count_ones(..) - and_.count_ones(..)) as f32;
+    return and_.count_ones(..) as f32
+        / (a.count_ones(..) + b.count_ones(..) - and_.count_ones(..)) as f32;
 }
 
 #[cfg(test)]
 mod tests {
+    use crate::ringo::math::similarity::tanimoto::tanimoto_bitset;
     use fixedbitset::FixedBitSet;
-    use crate::ringo::math::similarity::tanimoto::{tanimoto_bitset};
 
     #[test]
     fn test_tanimoto_bitset_033() {
diff --git a/src/ringo/molecule/model/molecule.rs b/src/ringo/molecule/model/molecule.rs
index f2ded08..18572ab 100644
--- a/src/ringo/molecule/model/molecule.rs
+++ b/src/ringo/molecule/model/molecule.rs
@@ -1,17 +1,17 @@
+use crate::ringo::math::similarity::tanimoto::tanimoto_bitset;
 use crate::ringo::molecule::model::atom::Atom;
 use crate::ringo::molecule::model::bond::Bond;
 use crate::ringo::molecule::model::element::atomic_weight;
+use crate::ringo::molecule::smiles::reader::molecule::parse_molecule;
 use crate::ringo::ringo::fingerprint::Fingerprint;
+use fixedbitset::FixedBitSet;
 use petgraph::stable_graph::{EdgeIndex, NodeIndex, StableGraph};
 use petgraph::visit::EdgeRef;
 use petgraph::Undirected;
 use std::borrow::Borrow;
-use std::collections::{BTreeSet};
 use std::collections::hash_map::DefaultHasher;
+use std::collections::BTreeSet;
 use std::hash::Hasher;
-use fixedbitset::FixedBitSet;
-use crate::ringo::math::similarity::tanimoto::tanimoto_bitset;
-use crate::ringo::molecule::smiles::reader::molecule::parse_molecule;
 
 pub struct Molecule {
     graph: StableGraph<Atom, Bond, Undirected>,
@@ -92,7 +92,15 @@ impl Molecule {
         let mut fp = FixedBitSet::new();
 
         for node in self.graph.node_indices() {
-            ecfp_recursive(&self.graph, radius, 1, node, &mut fp, fp_length, &mut DefaultHasher::new());
+            ecfp_recursive(
+                &self.graph,
+                radius,
+                1,
+                node,
+                &mut fp,
+                fp_length,
+                &mut DefaultHasher::new(),
+            );
         }
 
         Fingerprint(fp)
@@ -108,7 +116,6 @@ fn ecfp_recursive(
     fp_length: usize,
     hasher: &mut DefaultHasher,
 ) {
-
     if depth > radius {
         return;
     }
@@ -136,11 +143,16 @@ fn ecfp_recursive(
     }
 }
 
-
 #[test]
 fn test_ecfp() {
-    let ecfp_ibuprofen = parse_molecule("CC(C)CC1=CC=C(C=C1)C(C)C(=O)O").unwrap().1.ecfp(2, 128);
-    let ecfp_naproxen = parse_molecule("CC(C1=CC2=C(C=C1)C=C(C=C2)OC)C(=O)O").unwrap().1.ecfp(2, 128);
+    let ecfp_ibuprofen = parse_molecule("CC(C)CC1=CC=C(C=C1)C(C)C(=O)O")
+        .unwrap()
+        .1
+        .ecfp(2, 128);
+    let ecfp_naproxen = parse_molecule("CC(C1=CC2=C(C=C1)C=C(C=C2)OC)C(=O)O")
+        .unwrap()
+        .1
+        .ecfp(2, 128);
     let sim = tanimoto_bitset(&ecfp_ibuprofen.0, &ecfp_naproxen.0);
     assert!(0.53 < sim && sim < 0.54);
 }
diff --git a/src/ringo/molecule/smiles/reader/molecule.rs b/src/ringo/molecule/smiles/reader/molecule.rs
index 573f446..3e15b68 100644
--- a/src/ringo/molecule/smiles/reader/molecule.rs
+++ b/src/ringo/molecule/smiles/reader/molecule.rs
@@ -34,7 +34,6 @@ pub(crate) fn parse_molecule(input: &str) -> IResult<&str, Molecule> {
     let mut prev_node = NodeIndex::end();
     let mut prev_bond = BondOrder::Single;
 
-
     for (atom, bond, cycle_digit, open_paren) in atoms_and_bonds {
         if let Some(open) = open_paren {
             if open {
@@ -223,11 +222,15 @@ mod tests {
             7
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1))
+                .unwrap()
+                .order,
             BondOrder::Double
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(2)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(2))
+                .unwrap()
+                .order,
             BondOrder::Single
         );
     }
@@ -250,11 +253,15 @@ mod tests {
             7
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1))
+                .unwrap()
+                .order,
             BondOrder::Double
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(2)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(2))
+                .unwrap()
+                .order,
             BondOrder::Double
         );
     }
@@ -285,19 +292,27 @@ mod tests {
             7
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1))
+                .unwrap()
+                .order,
             BondOrder::Double
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(2)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(2))
+                .unwrap()
+                .order,
             BondOrder::Double
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(3)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(3))
+                .unwrap()
+                .order,
             BondOrder::Single
         );
         assert_eq!(
-            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(4)).unwrap().order,
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(4))
+                .unwrap()
+                .order,
             BondOrder::Single
         );
     }
@@ -324,16 +339,35 @@ mod tests {
             16
         );
         assert!(m.has_bond(NodeIndex::new(0), NodeIndex::new(1)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1)).unwrap().order == BondOrder::Single);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1))
+                .unwrap()
+                .order
+                == BondOrder::Single
+        );
         assert!(m.has_bond(NodeIndex::new(1), NodeIndex::new(2)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(2)).unwrap().order == BondOrder::Single);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(2))
+                .unwrap()
+                .order
+                == BondOrder::Single
+        );
         assert!(m.has_bond(NodeIndex::new(0), NodeIndex::new(2)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(2)).unwrap().order == BondOrder::Double);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(2))
+                .unwrap()
+                .order
+                == BondOrder::Double
+        );
         assert!(m.has_bond(NodeIndex::new(2), NodeIndex::new(3)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(2), NodeIndex::new(3)).unwrap().order == BondOrder::Single);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(2), NodeIndex::new(3))
+                .unwrap()
+                .order
+                == BondOrder::Single
+        );
     }
 
-
     #[test]
     fn parse_molecule_cycle_branch() {
         let m = parse_molecule("N1C(=P)S=1O").unwrap().1;
@@ -360,15 +394,40 @@ mod tests {
             8
         );
         assert!(m.has_bond(NodeIndex::new(0), NodeIndex::new(1)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1)).unwrap().order == BondOrder::Single);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(0), NodeIndex::new(1))
+                .unwrap()
+                .order
+                == BondOrder::Single
+        );
         assert!(m.has_bond(NodeIndex::new(1), NodeIndex::new(2)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(2)).unwrap().order == BondOrder::Double);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(2))
+                .unwrap()
+                .order
+                == BondOrder::Double
+        );
         assert!(m.has_bond(NodeIndex::new(1), NodeIndex::new(3)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(3)).unwrap().order == BondOrder::Single);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(1), NodeIndex::new(3))
+                .unwrap()
+                .order
+                == BondOrder::Single
+        );
         assert!(m.has_bond(NodeIndex::new(3), NodeIndex::new(4)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(3), NodeIndex::new(4)).unwrap().order == BondOrder::Single);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(3), NodeIndex::new(4))
+                .unwrap()
+                .order
+                == BondOrder::Single
+        );
         assert!(m.has_bond(NodeIndex::new(3), NodeIndex::new(0)));
-        assert!(m.get_bond_by_atoms(NodeIndex::new(3), NodeIndex::new(0)).unwrap().order == BondOrder::Double);
+        assert!(
+            m.get_bond_by_atoms(NodeIndex::new(3), NodeIndex::new(0))
+                .unwrap()
+                .order
+                == BondOrder::Double
+        );
     }
 
     #[test]
diff --git a/src/ringo/ringo.rs b/src/ringo/ringo.rs
index 559227b..df87b4d 100644
--- a/src/ringo/ringo.rs
+++ b/src/ringo/ringo.rs
@@ -1,4 +1,4 @@
+pub(crate) mod fingerprint;
 mod index;
-mod search;
 mod index_item;
-pub(crate) mod fingerprint;
+mod search;
diff --git a/src/ringo/ringo/fingerprint.rs b/src/ringo/ringo/fingerprint.rs
index 55dc0d0..14997b6 100644
--- a/src/ringo/ringo/fingerprint.rs
+++ b/src/ringo/ringo/fingerprint.rs
@@ -32,8 +32,8 @@ impl<'de> bincode::BorrowDecode<'de> for Fingerprint {
 
 #[cfg(test)]
 mod tests {
-    use fixedbitset::{FixedBitSet};
     use crate::ringo::ringo::fingerprint::{Fingerprint, FINGERPRINT_SIZE};
+    use fixedbitset::FixedBitSet;
 
     #[test]
     fn test_fingerprint_encode_decode() {
@@ -42,7 +42,10 @@ mod tests {
         fp.0.set(17, true);
 
         let encoded = bincode::encode_to_vec(&fp, bincode::config::standard()).unwrap();
-        let decoded: Fingerprint = bincode::decode_from_slice(&encoded, bincode::config::standard()).unwrap().0;
+        let decoded: Fingerprint =
+            bincode::decode_from_slice(&encoded, bincode::config::standard())
+                .unwrap()
+                .0;
         assert_eq!(decoded.0.ones().collect::<Vec<usize>>(), vec![1, 17]);
     }
 }
diff --git a/src/ringo/ringo/index.rs b/src/ringo/ringo/index.rs
index 9efb2d3..6ea8108 100644
--- a/src/ringo/ringo/index.rs
+++ b/src/ringo/ringo/index.rs
@@ -1,7 +1,7 @@
-use std::fs::File;
-use std::io::{BufRead};
 use crate::ringo::molecule::smiles::reader::molecule::parse_molecule;
 use crate::ringo::ringo::index_item::IndexItem;
+use std::fs::File;
+use std::io::BufRead;
 
 fn index(smiles_file: &str) {
     // open file for reading
@@ -13,12 +13,14 @@ fn index(smiles_file: &str) {
     for line in std::io::BufReader::new(fi).lines() {
         let line = line.unwrap();
         let molecule = parse_molecule(&line).unwrap().1;
-        IndexItem{position: offset, fingerprint: molecule.ecfp(2, 512)};
+        IndexItem {
+            position: offset,
+            fingerprint: molecule.ecfp(2, 512),
+        };
         offset += line.len() + 1;
     }
 }
 
-
 #[test]
 fn test_index() {
     index("molecules.smi");
diff --git a/src/ringo/ringo/index_item.rs b/src/ringo/ringo/index_item.rs
index f4c25ea..ad33538 100644
--- a/src/ringo/ringo/index_item.rs
+++ b/src/ringo/ringo/index_item.rs
@@ -1,30 +1,36 @@
-use bincode::{Decode, Encode};
 use crate::ringo::ringo::fingerprint::Fingerprint;
+use bincode::{Decode, Encode};
 
 #[derive(Debug, Encode, Decode)]
 pub struct IndexItem {
     pub position: usize,
-    pub fingerprint: Fingerprint
+    pub fingerprint: Fingerprint,
 }
 
 #[cfg(test)]
 mod tests {
+    use crate::ringo::ringo::fingerprint::Fingerprint;
+    use crate::ringo::ringo::index_item::IndexItem;
     use bincode::config::standard;
     use bincode::{decode_from_slice, encode_to_vec};
     use fixedbitset::FixedBitSet;
-    use crate::ringo::ringo::index_item::IndexItem;
-    use crate::ringo::ringo::fingerprint::Fingerprint;
 
     #[test]
     fn test_index_item_encode_decode() {
         let fp = Fingerprint(FixedBitSet::with_capacity(512));
-        let mut ii = IndexItem {position: 0, fingerprint: fp};
+        let mut ii = IndexItem {
+            position: 0,
+            fingerprint: fp,
+        };
         ii.position = 0;
         ii.fingerprint.0.set(1, true);
         ii.fingerprint.0.set(17, true);
 
         let encoded = encode_to_vec(&ii, standard()).unwrap();
         let decoded: IndexItem = decode_from_slice(&encoded, standard()).unwrap().0;
-        assert_eq!(decoded.fingerprint.0.ones().collect::<Vec<usize>>(), vec![1, 17]);
+        assert_eq!(
+            decoded.fingerprint.0.ones().collect::<Vec<usize>>(),
+            vec![1, 17]
+        );
     }
-}
\ No newline at end of file
+}
diff --git a/src/ringo/ringo/search.rs b/src/ringo/ringo/search.rs
index e69de29..8b13789 100644
--- a/src/ringo/ringo/search.rs
+++ b/src/ringo/ringo/search.rs
@@ -0,0 +1 @@
+