fix: Fix COMPRESSION typo, correct DIGEST log tag, and refactor mode_update cloning

src/compression_engine.rs

@@ -97,7 +97,7 @@ pub trait CompressionEngine {
         loop {
             let n = reader.read(&mut buffer[..libc::BUFSIZ as usize])?;
             if n == 0 {
-                debug!("COMPREESSION: EOF");
+                debug!("COMPRESSION: EOF");
                 break;
             }