Update Exercises Directory Names to Reflect Order

exercises/01_variables/README.md

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+# Variables
+
+In Rust, variables are immutable by default.
+When a variable is immutable, once a value is bound to a name, you can’t change that value.
+You can make them mutable by adding `mut` in front of the variable name.
+
+## Further information
+
+- [Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html)

exercises/01_variables/variables1.rs

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+// variables1.rs
+//
+// Make me compile!
+//
+// Execute `rustlings hint variables1` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+fn main() {
+    x = 5;
+    println!("x has the value {}", x);
+}

exercises/01_variables/variables2.rs

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+// variables2.rs
+//
+// Execute `rustlings hint variables2` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+fn main() {
+    let x;
+    if x == 10 {
+        println!("x is ten!");
+    } else {
+        println!("x is not ten!");
+    }
+}

exercises/01_variables/variables3.rs

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+// variables3.rs
+//
+// Execute `rustlings hint variables3` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+fn main() {
+    let x: i32;
+    println!("Number {}", x);
+}

exercises/01_variables/variables4.rs

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+// variables4.rs
+//
+// Execute `rustlings hint variables4` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+fn main() {
+    let x = 3;
+    println!("Number {}", x);
+    x = 5; // don't change this line
+    println!("Number {}", x);
+}

exercises/01_variables/variables5.rs

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+// variables5.rs
+//
+// Execute `rustlings hint variables5` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+fn main() {
+    let number = "T-H-R-E-E"; // don't change this line
+    println!("Spell a Number : {}", number);
+    number = 3; // don't rename this variable
+    println!("Number plus two is : {}", number + 2);
+}

exercises/01_variables/variables6.rs

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+// variables6.rs
+//
+// Execute `rustlings hint variables6` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+const NUMBER = 3;
+fn main() {
+    println!("Number {}", NUMBER);
+}