diff --git a/utils/app/src/lib.rs b/utils/app/src/lib.rs
index 64ad2a1..eaf3cce 100644
--- a/utils/app/src/lib.rs
+++ b/utils/app/src/lib.rs
@@ -157,11 +157,10 @@ pub fn dataset_append(original_data: &str, new_data: &str) -> PyResult<(String,
         let message = format!("enclave ECALL failed: {result}!");
         return Err(PyValueError::new_err(message));
     }
-    let complete_data =
-        unsafe { slice::from_raw_parts(complete_data.as_ptr(), complete_data_len.into()) };
+    let complete_data = unsafe { slice::from_raw_parts(complete_data.as_ptr(), complete_data_len) };
     let complete_data_hash =
         unsafe { slice::from_raw_parts(complete_data_hash.as_ptr(), HASH_SIZE_IN_BYTES) };
-    let complete_data = String::from_utf8_lossy(&complete_data);
-    let complete_data_hash = String::from_utf8_lossy(&complete_data_hash);
+    let complete_data = String::from_utf8_lossy(complete_data);
+    let complete_data_hash = String::from_utf8_lossy(complete_data_hash);
     Ok((complete_data.into(), complete_data_hash.into()))
 }