fix links to updated exercises, improve exercise e wording

Author: CleanCut

Diff for: README.md

@@ -83,17 +83,17 @@ For your convenience, here is a list of all the exercises, with links to view th
 
 - [Exercise A - Variables & Scope](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/a_variables)
 - [Exercise B - Functions](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/b_functions)
-- [Exercise C - Simple Types](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/c_simple_types)
-- [Exercise D - Control Flow & Strings](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/d_control_flow_strings)
-- [Exercise E - Ownership & References](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/e_ownership_references)
-- [Exercise F - Structs & Traits](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/f_structs_traits)
-- [Exercise G - Collections & Enums](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/g_collections_enums)
-- [Exercise H - Closures & Threads](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/h_closures_threads)
-- [Exercise Z - Final Project](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/z_final_project)
+- [Exercise C - Modules](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/c_modules)
+- [Exercise D - Simple Types](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/d_simple_types)
+- [Exercise E - Control Flow](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/e_control_flow)
+- [Exercise ? - Ownership & References](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/)
+- [Exercise ? - Structs & Traits](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/)
+- [Exercise ? - Collections & Enums](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/)
+- [Exercise Z - Image Manipulation](https://github.com/CleanCut/ultimate_rust_crash_course/tree/master/exercise/z_final_project)
 
 # Projects
 
-- [Invaders](https://github.com/CleanCut/invaders) - A terminal-based Space Invaders arcade game clone.
+- TBD
 
 
 [exercises]: https://github.com/CleanCut/ultimate_rust_crash_course#exercises

Diff for: exercise/e_control_flow/src/main.rs

@@ -31,13 +31,14 @@ fn main() {
 
     // 3. Use a `while` loop to create a vector containing the first 12 multiples of 5.
     //
-    // The loop should continue until `fives.len()` returns 12.
+    // The loop should continue while `fives.len()` is less than 12.
     //
-    // Each time through the loop, call `fives.push( ... )` to push `current_five` onto the vector,
-    // and then add 5 to `current_five`.
+    // Each time through the loop:
+    // - Call `fives.push( ... )` to push `multiple` onto the vector
+    // - Add 5 to `multiple`
 
     let mut fives: Vec<i32> = vec![];
-    let mut current_five = 5;
+    let mut multiple = 5;
 
     // (write the `while` loop here)