Cannot find Contract address and interface verification

[Flydexo]

Hello, I am trying to implement CW1155 requirements on my contract. The first execute "send_from" requires this:

If to is an address controlled by a smart contract, it must implement the CW1155Receiver interface, msg will be passed to it along with other fields, otherwise, msg should be None.

But in the send_from function it only sends the message to the "to" address and I don't find where it verifies if the address is pointing to a contract and if the contract implements the CW1155Receive interface.

pub fn execute_send_from(
    env: ExecuteEnv,
    from: String,
    to: String,
    token_id: TokenId,
    amount: Uint128,
    msg: Option<Binary>,
) -> Result<Response, ContractError> {
    let from_addr = env.deps.api.addr_validate(&from)?;
    let to_addr = env.deps.api.addr_validate(&to)?;

    let ExecuteEnv {
        mut deps,
        env,
        info,
    } = env;

    guard_can_approve(deps.as_ref(), &env, &from_addr, &info.sender)?;

    let mut rsp = Response::default();

    let event = execute_transfer_inner(
        &mut deps,
        Some(&from_addr),
        Some(&to_addr),
        &token_id,
        amount,
    )?;
    event.add_attributes(&mut rsp);

    if let Some(msg) = msg {
        rsp.messages = vec![SubMsg::new(
            Cw1155ReceiveMsg {
                operator: info.sender.to_string(),
                from: Some(from),
                amount,
                token_id: token_id.clone(),
                msg,
            }
            .into_cosmos_msg(to)?,
        )]
    }

    Ok(rsp)
}

[uint]

Closing as cw1155 has been removed from this repo