src/lib.rs:27:1: 38:2 error: not all control paths return a value [E0269]
src/lib.rs:27 pub fn multihash(wanthash: hashtypes, input: Vec<u8>) -> Result<Vec<u8>, String> {
src/lib.rs:28     let ssl_hash: Option<Type> = match wanthash {
src/lib.rs:29         hashtypes::sha1 => Some(Type::SHA1),
src/lib.rs:30         hashtypes::sha2_256 => Some(Type::SHA256),
src/lib.rs:31         hashtypes::sha2_512 => Some(Type::SHA512),
src/lib.rs:32         _ => None,