Update fuzzing test

add corpus

examples/lazy-reader-tests/fuzz/Makefile

@@ -1,12 +1,21 @@
 
+
+# To accelerate the fuzzing process, please download the pre-made corpus file
+# from the following link:
+# https://gist.github.com/XuJiandong/852905df792d34a3400b98145b0f69e7 Save the
+# file named corpus.bin to the corpus/fuzz_target_1/ folder.
+
 all:
 	cargo fuzz run -j40 fuzz_target_1
 
 cov:
 	cargo fuzz coverage fuzz_target_1 
-	cargo cov -- show target/x86_64-unknown-linux-gnu/release/fuzz_target_1 \
+
+show:
+	~/.rustup/toolchains/nightly-2023-07-26-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov \
+	show target/x86_64-unknown-linux-gnu/release/fuzz_target_1 \
     --format=html \
-    -instr-profile=coverage/fuzz_target_1/coverage.profdata \
+    --instr-profile=coverage/fuzz_target_1/coverage.profdata \
     > coverage.html
 
 install: