add fuzzing for the date function

Work done Rafał Mikrut

src/uu/date/fuzz/.gitignore

@@ -0,0 +1,3 @@
+target
+corpus
+artifacts

src/uu/date/fuzz/Cargo.toml

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+# spell-checker:ignore libfuzzer
+
+[package]
+name = "uu_date-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.uu_date]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"
+test = false
+doc = false

src/uu/date/fuzz/fuzz_targets/fuzz_target_1.rs

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+// spell-checker:ignore libfuzzer
+
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use std::ffi::OsString;
+use uu_date::uumain;
+
+fuzz_target!(|data: &[u8]| {
+    let iter: Vec<OsString> = [""].into_iter().map(|e| OsString::from(e)).collect();
+    let it2 = iter.into_iter();
+    uumain(it2);
+});