remove old sign extend files

gadgets/src/bits/mod.rs

@@ -20,6 +20,3 @@ pub use self::adder::*;
 
 pub mod rca;
 pub use self::rca::*;
-
-// pub mod sign_extend;
-// pub use self::sign_extend::*;

gadgets/src/bits/sign_extend.rs

@@ -1,42 +0,0 @@
-// Copyright (C) 2019-2021 Aleo Systems Inc.
-// This file is part of the Leo library.
-
-// The Leo library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// The Leo library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
-
-use snarkvm_gadgets::traits::utilities::boolean::Boolean;
-
-use std::iter;
-
-/// Sign extends an array of bits to the desired length.
-/// Expects least significant bit first
-pub trait SignExtend
-where
-    Self: std::marker::Sized,
-{
-    #[must_use]
-    fn sign_extend(bits: &[Boolean], length: usize) -> Vec<Boolean>;
-}
-
-impl SignExtend for Boolean {
-    fn sign_extend(bits: &[Boolean], length: usize) -> Vec<Boolean> {
-        let msb = bits.last().expect("empty bit list");
-        let bits_needed = length - bits.len();
-
-        let mut result = Vec::with_capacity(length);
-        result.extend_from_slice(bits);
-        result.extend(iter::repeat(*msb).take(bits_needed));
-
-        result
-    }
-}