move old files to a separate directory

old_curriculum/variables/variables1.rs

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+// variables1.rs
+// Make me compile! Scroll down for hints :)
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+fn main() {
+    x = 5;
+    println!("x has the value {}", x);
+}
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+// Hint: The declaration on line 5 is missing a keyword that is needed in Rust
+// to create a new variable binding.