Mismatch between exercise code and docs - hashes

[matthabermehl]

The first code block in the docs here,

#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct SomeExternalInput {
    title: String,
    content: String,
}

pub fn add_book(input: SomeExternalInput) -> ExternResult<EntryHash> {
    unimplemented!();
}

pub fn get_book(hash: String) -> ExternResult<Book> {
    unimplemented()
}

provides SomeExternalInput whereas the developer exercises repo here provides Book which we are told to implement:

entry_defs![Book::entry_def()];

#[hdk_entry(id = "book")]
pub struct Book {
    title: String,
    content: String,
}

[matthabermehl]

PR holochain-gym/developer-exercises#50