diff --git a/src/assignment_map.rs b/src/assignment_map.rs
index 1695813..6269ac5 100644
--- a/src/assignment_map.rs
+++ b/src/assignment_map.rs
@@ -21,9 +21,7 @@ pub struct AssignmentMap<F: FieldExt>(BTreeMap<usize, Vec<(Column, Value<F>)>>);
 
 impl<F: FieldExt> AssignmentMap<F> {
     pub fn new(stream: impl ParallelIterator<Item = Assignment<F>>) -> Self {
-        let mut sorted_by_offset: Vec<_> = stream
-            .map(|a| (a.offset, a.column, a.value))
-            .collect();
+        let mut sorted_by_offset: Vec<_> = stream.map(|a| (a.offset, a.column, a.value)).collect();
         sorted_by_offset.sort_by(|x, y| x.0.cmp(&y.0));
         let grouped_by_offset = sorted_by_offset.iter().group_by(|(offset, _, _)| offset);
         let y: BTreeMap<_, _> = grouped_by_offset
diff --git a/src/gadgets/byte_bit.rs b/src/gadgets/byte_bit.rs
index 14840a7..e0affc5 100644
--- a/src/gadgets/byte_bit.rs
+++ b/src/gadgets/byte_bit.rs
@@ -1,10 +1,6 @@
 use super::super::constraint_builder::{ConstraintBuilder, FixedColumn, Query};
 use crate::assignment_map::{Assignment, Column};
-use halo2_proofs::{
-    arithmetic::FieldExt,
-    circuit::{Region, Value},
-    plonk::ConstraintSystem,
-};
+use halo2_proofs::{arithmetic::FieldExt, circuit::Region, plonk::ConstraintSystem};
 use rayon::prelude::*;
 
 // TODO: fix name to configggggggg
diff --git a/src/gadgets/byte_representation.rs b/src/gadgets/byte_representation.rs
index 737c3d0..0cf90df 100644
--- a/src/gadgets/byte_representation.rs
+++ b/src/gadgets/byte_representation.rs
@@ -111,11 +111,18 @@ impl ByteRepresentationConfig {
             .collect();
         for assignment in assignments.into_iter() {
             match assignment.column {
-                Column::Selector(s) => region.assign_fixed(|| "fixed", s.0, assignment.offset, || assignment.value),
-                Column::Advice(s) => region.assign_advice(|| "advice", s.0, assignment.offset, || assignment.value),
-                Column::SecondPhaseAdvice(s) => {
-                    region.assign_advice(|| "second phase advice", s.0, assignment.offset, || assignment.value)
+                Column::Selector(s) => {
+                    region.assign_fixed(|| "fixed", s.0, assignment.offset, || assignment.value)
                 }
+                Column::Advice(s) => {
+                    region.assign_advice(|| "advice", s.0, assignment.offset, || assignment.value)
+                }
+                Column::SecondPhaseAdvice(s) => region.assign_advice(
+                    || "second phase advice",
+                    s.0,
+                    assignment.offset,
+                    || assignment.value,
+                ),
                 _ => unreachable!(),
             }
             .unwrap();
diff --git a/src/gadgets/is_zero.rs b/src/gadgets/is_zero.rs
index c7389e8..2f65351 100644
--- a/src/gadgets/is_zero.rs
+++ b/src/gadgets/is_zero.rs
@@ -1,10 +1,6 @@
-use crate::assignment_map::{Assignment, Column};
+use crate::assignment_map::Assignment;
 use crate::constraint_builder::{AdviceColumn, BinaryQuery, ConstraintBuilder, Query};
-use halo2_proofs::{
-    arithmetic::FieldExt,
-    circuit::{Region, Value},
-    plonk::ConstraintSystem,
-};
+use halo2_proofs::{arithmetic::FieldExt, circuit::Region, plonk::ConstraintSystem};
 use std::fmt::Debug;
 
 #[derive(Clone, Copy)]
diff --git a/src/gadgets/key_bit.rs b/src/gadgets/key_bit.rs
index f86c4b1..8b0287b 100644
--- a/src/gadgets/key_bit.rs
+++ b/src/gadgets/key_bit.rs
@@ -7,10 +7,7 @@ use crate::{
     constraint_builder::{AdviceColumn, ConstraintBuilder, Query, SelectorColumn},
 };
 use halo2_proofs::{
-    arithmetic::FieldExt,
-    circuit::{Region, Value},
-    halo2curves::bn256::Fr,
-    plonk::ConstraintSystem,
+    arithmetic::FieldExt, circuit::Region, halo2curves::bn256::Fr, plonk::ConstraintSystem,
 };
 use rayon::prelude::*;
 
diff --git a/src/mpt.rs b/src/mpt.rs
index a98f1cd..66f2229 100644
--- a/src/mpt.rs
+++ b/src/mpt.rs
@@ -1,5 +1,5 @@
 use crate::{
-    assignment_map::{AssignmentMap, Column, Assignment},
+    assignment_map::{Assignment, AssignmentMap},
     constraint_builder::{ConstraintBuilder, SelectorColumn},
     gadgets::{
         byte_bit::ByteBitGadget,
@@ -18,7 +18,7 @@ use crate::{
 };
 use halo2_proofs::{
     arithmetic::FieldExt,
-    circuit::{Layouter, Value},
+    circuit::Layouter,
     halo2curves::bn256::Fr,
     plonk::{Challenge, ConstraintSystem, Error, Expression, VirtualCells},
 };