add line space for .md file

Author: Ben-cpy

fuzz/README.md

@@ -1,6 +1,7 @@
 # Building
 
 ## Build Requirements
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 Note that `LibFuzzer` is part of `clang`, LibFuzzer is an in-process, coverage-guided, evolutionary fuzzing engine.   
 `LibFuzzer` is linked with the library under test, and feeds fuzzed inputs to the library via a specific fuzzing entrypoint (aka “target function”); the fuzzer then tracks which areas of the code are reached, and generates mutations on the corpus of input data in order to maximize the code coverage. 
 
@@ -18,6 +19,7 @@ yum install -y clang
 ```
 
 ## Build and Install
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 To build fuzzer program, just add `-DBUILD_FUZZ=on` option is enough, then you would see fuzz program in `/usr/share/rats-tls/fuzz`.
 
 ```shell
@@ -28,7 +30,9 @@ make -C build install
 # FUZZ
 
 ## rats_tls_init API
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 To fuzz `rats_tls_init()`, we use random input `* data` to fill the `conf`, and set value to part of the `conf` in order to run `rats_tls_init()` more frequently.
+
 ```bash
 cd /usr/share/rats-tls/fuzz/
 mkdir corpus && cd corpus  # create corpus dir
@@ -38,7 +42,9 @@ cd ..
 ```
 
 ## rats_tls_negotiate API
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 Start the `/usr/share/rats_tls/fuzz/fuzz_server` first, then use `tls_negotiate` to connect to server and fuzz the `rats_tls_negotiate()` API.
+
 ```bash
 cd /usr/share/rats_tls/fuzz/
 mkdir corpus && cd corpus  # create corpus dir
@@ -49,7 +55,9 @@ cd ..
 ```
 
 ## rats_tls_transmit / rats_tls_recv / rats_tls_cleanup
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 We synthesis the 3 sequential API in one program, start the `/usr/share/rats_tls/fuzz/fuzz_server` first, then use `tls_transmit` to connect to server and fuzz the `rats_tls_transmit()` and `rats_tls_recv()`,`rats_tls_cleanup` APIs by sending ramdom string and receiving the same response.
+
 ```shell
 cd /usr/share/rats_tls/fuzz/
 mkdir corpus && cd corpus  # create corpus dir and fill in random string