Rename sheet folders to assure proper sorting

aufgaben/sheet03/task1/rule90.rs

@@ -0,0 +1,51 @@
+//! Task 3.1: Rule 90
+
+fn main() {
+    // TODO: Task 1c)
+}
+
+/// Reads a valid initial configuration for our automaton from the terminal.
+fn read_input() -> Vec<bool> {
+    // This tries to read a string from the terminal, checks whether it's
+    // valid (only contains 1's and 0's). If the user fails to input a correct
+    // string, this routine will ask again until the user finally manages to
+    // give us a correct string.
+    //
+    // You don't need to understand this routine yet; that's why I've written
+    // it already ;-)
+    //
+    // You only need to use the `input` variable (of type `String`). You can
+    // also assume that it only contains '0' and '1' chars.
+    let input = {
+        let mut buffer = String::new();
+
+        loop {
+            println!("Please give me the initial configuration (a string of '0' and '1'!):");
+            buffer.clear();
+
+            // `read_line` returns an error if the input isn't valid UTF8 or if
+            // a strange IO error occured. We just panic in that case...
+            std::io::stdin()
+                .read_line(&mut buffer)
+                .expect("something went seriously wrong :O");
+
+            if buffer.trim().chars().all(|c| c == '1' || c == '0') {
+                break;
+            }
+        }
+
+        buffer.trim().to_string()
+    };
+
+    // TODO: Task 1a)
+}
+
+// TODO: Task 1b)
+
+#[test]
+fn rule90_rules() {
+    assert_eq!(next_step(&[false, false, false]), vec![false, false, false]);
+    assert_eq!(next_step(&[ true, false, false]), vec![false,  true,  true]);
+    assert_eq!(next_step(&[ true,  true, false]), vec![ true,  true, false]);
+    assert_eq!(next_step(&[ true,  true,  true]), vec![false, false, false]);
+}