Function transfer_chat_ownership 

pub async fn transfer_chat_ownership(
    chat_id: i64,
    user_id: i64,
    password: String,
    client_id: i32,
) -> Result<(), Error>

Changes the owner of a chat; requires owner privileges in the chat. Use the method canTransferOwnership to check whether the ownership can be transferred from the current session. Available only for supergroups and channel chats

Arguments

• chat_id - Chat identifier
• user_id - Identifier of the user to which transfer the ownership. The ownership can’t be transferred to a bot or to a deleted user
• password - The 2-step verification password of the current user
• client_id - The client id to send the request to