diff --git a/src/qibotn/circuit_to_mps.py b/src/qibotn/circuit_to_mps.py
index 3027a75..48ebde7 100644
--- a/src/qibotn/circuit_to_mps.py
+++ b/src/qibotn/circuit_to_mps.py
@@ -8,7 +8,7 @@ from qibotn.mps_utils import apply_gate, initial
 
 class QiboCircuitToMPS:
     """A helper class to convert Qibo circuit to MPS.
-    
+
     Parameters:
         circ_qibo: The quantum circuit object.
         gate_algo(dict): Dictionary for SVD and QR settings.
@@ -18,6 +18,7 @@ class QiboCircuitToMPS:
     Return:
         None.
     """
+
     def __init__(
         self,
         circ_qibo,
diff --git a/src/qibotn/mps_contraction_helper.py b/src/qibotn/mps_contraction_helper.py
index c29dc92..e562850 100644
--- a/src/qibotn/mps_contraction_helper.py
+++ b/src/qibotn/mps_contraction_helper.py
@@ -19,7 +19,7 @@ class MPSContractionHelper:
 
     Parameters:
         num_qubits: The number of qubits for the MPS.
-        
+
     Return:
         None.
     """
diff --git a/src/qibotn/mps_utils.py b/src/qibotn/mps_utils.py
index f29685b..878a5aa 100644
--- a/src/qibotn/mps_utils.py
+++ b/src/qibotn/mps_utils.py
@@ -5,11 +5,11 @@ from cuquantum.cutensornet.experimental import contract_decompose
 
 def initial(num_qubits, dtype):
     r"""Generate the MPS with an initial state of :math:`\ket{00...00}`
-    
+
     Parameters:
         num_qubits: Number of qubits in the Quantum Circuit.
         dtype: Either single ("complex64") or double (complex128) precision.
-    
+
     Returns:
         The initial MPS tensors.
     """
@@ -20,11 +20,11 @@ def initial(num_qubits, dtype):
 
 def mps_site_right_swap(mps_tensors, i, **kwargs):
     """Perform the swap operation between the ith and i+1th MPS tensors.
-    
+
     Parameters:
         mps_tensors: Tensors representing MPS
         i (int): index of the tensor to swap
-    
+
     Returns:
         The updated MPS tensors.
     """