add week 1 day 3 blocks

Signed-off-by: Alex Chi Z <iskyzh@gmail.com>

mini-lsm-starter/src/block.rs

@@ -5,22 +5,13 @@ mod builder;
 mod iterator;
 
 pub use builder::BlockBuilder;
-/// You may want to check `bytes::BufMut` out when manipulating continuous chunks of memory
 use bytes::Bytes;
 pub use iterator::BlockIterator;
 
-/// A block is the smallest unit of read and caching in LSM tree.
-/// It is a collection of sorted key-value pairs.
-/// The `actual` storage format is as below (After `Block::encode`):
-///
-/// ----------------------------------------------------------------------------------------------------
-/// |             Data Section             |              Offset Section             |      Extra      |
-/// ----------------------------------------------------------------------------------------------------
-/// | Entry #1 | Entry #2 | ... | Entry #N | Offset #1 | Offset #2 | ... | Offset #N | num_of_elements |
-/// ----------------------------------------------------------------------------------------------------
+/// A block is the smallest unit of read and caching in LSM tree. It is a collection of sorted key-value pairs.
 pub struct Block {
-    data: Vec<u8>,
-    offsets: Vec<u16>,
+    pub(crate) data: Vec<u8>,
+    pub(crate) offsets: Vec<u16>,
 }
 
 impl Block {
@@ -35,6 +26,3 @@ impl Block {
         unimplemented!()
     }
 }
-
-#[cfg(test)]
-mod tests;