You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: string.rs
    path of file: ./repos/snarkVM/console/account/src/view_key
    
    the code of the file until where you have to start completion: // Copyright (C) 2019-2023 Aleo Systems Inc.
// This file i
    
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        // Write the view key bytes.
        let mut view_key = [0u8; 39];
        view_key[0..7].copy_from_slice(&VIEW_KEY_PREFIX);
        self.0.write_le(&mut view_key[7..39]).map_err(|_| fmt::Error)?;
        // Encode the view key into base58.
        write!(f, "{}", bs58::encode(view_key).into_string())
    }