Initial data commit

Task/Gray-code/Rust/gray-code.rust

@@ -0,0 +1,18 @@
+fn gray_encode(integer: u64) -> u64 {
+    (integer >> 1) ^ integer
+}
+
+fn gray_decode(integer: u64) -> u64 {
+    match integer {
+        0 => 0,
+        _ => integer ^ gray_decode(integer >> 1)
+    }
+}
+
+fn main() {
+    for i in 0..32 {
+        println!("{:2} {:0>5b} {:0>5b} {:2}", i, i, gray_encode(i),
+            gray_decode(i));
+    }
+
+}