Add fuzzing

backend/fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

backend/fuzz/Cargo.toml

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+[package]
+name = "reconcile-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+reconcile = { path = "../reconcile" }
+
+[[bin]]
+name = "reconcile"
+path = "fuzz_targets/reconcile.rs"
+test = false
+doc = false
+bench = false

backend/fuzz/fuzz_targets/reconcile.rs

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+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+extern crate reconcile;
+
+fuzz_target!(|texts: (String, String, String)| {
+    let (original, left, right) = texts;
+    reconcile::reconcile(&original, &left, &right);
+});