diff --git a/src/channel/channel.cairo b/src/channel/channel.cairo
index b7542dbe0..120fbbeeb 100644
--- a/src/channel/channel.cairo
+++ b/src/channel/channel.cairo
@@ -53,7 +53,8 @@ impl ChannelImpl of ChannelTrait {
         let mut res = ArrayTrait::<felt252>::new();
         loop {
             if n != 0 {
-                res.append(self.random_felt_to_prover())
+                res.append(self.random_felt_to_prover());
+                n -= 1;
             } else {
                 break;
             }
diff --git a/src/common/tests/test_math.cairo b/src/common/tests/test_math.cairo
index 61d0066ac..0ddceec9e 100644
--- a/src/common/tests/test_math.cairo
+++ b/src/common/tests/test_math.cairo
@@ -55,7 +55,10 @@ fn test_mul_inverse_3() {
 fn test_mul_inverse_4() {
     let x = 3;
     let inv_x = mul_inverse(x);
-    assert(inv_x == 1206167596222043737899107594365023368541035738443865566657697352045290673494, 'Invalid value');
+    assert(
+        inv_x == 1206167596222043737899107594365023368541035738443865566657697352045290673494,
+        'Invalid value'
+    );
     assert(x * inv_x == 1, 'Invalid value');
 }
 
@@ -73,4 +76,4 @@ fn test_mul_inverse_6() {
     let x = 19345680409051406060084;
     let inv_inv_x = mul_inverse(mul_inverse(x));
     assert(x == inv_inv_x, 'Invalid value');
-}
\ No newline at end of file
+}
diff --git a/src/lib.cairo b/src/lib.cairo
index 904271d9d..d6e811a6c 100644
--- a/src/lib.cairo
+++ b/src/lib.cairo
@@ -1,5 +1,6 @@
 const FIELD_GENERATOR: felt252 = 3;
-const FIELD_GENERATOR_INV: felt252 = 1206167596222043737899107594365023368541035738443865566657697352045290673494;
+const FIELD_GENERATOR_INV: felt252 =
+    1206167596222043737899107594365023368541035738443865566657697352045290673494;
 
 mod channel;
 mod common;
diff --git a/src/table_commitment.cairo b/src/table_commitment.cairo
index 0930add4b..38b38deda 100644
--- a/src/table_commitment.cairo
+++ b/src/table_commitment.cairo
@@ -2,22 +2,27 @@
 // these values from the channel.
 #[derive(Drop, Copy)]
 struct TableUnsentCommitment {
+    a: felt252, // dummy
     // vector: VectorUnsentCommitment,
 }
 
 // Commitment for a table (n_rows x n_columns) of field elements in montgomery form.
 #[derive(Drop, Copy)]
 struct TableCommitment {
+    a: felt252, // dummy
     // config: TableCommitmentConfig*,
     // vector_commitment: VectorCommitment*,
 }
 
 #[derive(Drop, Copy)]
 struct TableCommitmentConfig {
+    a: felt252, // dummy
     // n_columns: felt,
     // vector: VectorCommitmentConfig*,
 }
 
-fn table_commit(unsent_commitment: TableUnsentCommitment, config: TableCommitmentConfig) -> TableCommitment{
-    TableCommitment{}
-}
\ No newline at end of file
+fn table_commit(
+    unsent_commitment: TableUnsentCommitment, config: TableCommitmentConfig
+) -> TableCommitment {
+    TableCommitment {a: 0}
+}
diff --git a/src/vector_commitment.cairo b/src/vector_commitment.cairo
index 605431ed9..10ee68797 100644
--- a/src/vector_commitment.cairo
+++ b/src/vector_commitment.cairo
@@ -2,18 +2,21 @@
 // values from the channel.
 #[derive(Drop)]
 struct VectorUnsentCommitment {
+    a: felt252, // dummy
     // commitment_hash: ChannelUnsentFelt,
 }
 
 // Commitment for a vector of field elements.
 #[derive(Drop)]
 struct VectorCommitment {
+    a: felt252, // dummy
     // config: VectorCommitmentConfig*,
     // commitment_hash: ChannelSentFelt,
 }
 
 #[derive(Drop)]
 struct VectorCommitmentConfig {
+    a: felt252, // dummy
     // height: felt,
     // n_verifier_friendly_commitment_layers: felt,
 }