but this code works 
```rust
/// Generate CID with multihash for a given input
fn generate_cid(data: Vec<u8>) -> Vec<u8> {
  // gen the multihash with our default algo and bits
  let h = Blake2b256::digest(data.as_slice());

  // ALWAYS use V1, for now base32 is used 'coz it can't be changed
  // TODO double-check on the Codec::Raw

  let cid = Cid::new(Version::V1, Codec::Raw, h).unwrap();
  // create the string slice like `bafk...`
  let cid_str = multibase::encode(Base::Base32Lower, cid.to_bytes().as_slice());

  // make the string slice into vec bytes, usually we use that
  cid_str.into_bytes()
}

```