2: Add solutions for section "functions".

Dependencies

• [2] H6XH45OP 0

Change contents

• edit in exercises/functions/functions5.rs at line 3
  [2.130725]→[2.130725:130743](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/functions/functions5.rs at line 10
  [2.130858]→[2.130858:130873](∅→∅)
  − num * num;
  [2.130858]

  [2.130873]
  + num * num
• edit in exercises/functions/functions4.rs at line 6
  [2.131149]→[2.131149:131167](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/functions/functions4.rs at line 12
  [2.131279]→[2.131279:131310](∅→∅)
  − fn sale_price(price: i32) -> {
  [2.131279]

  [2.131310]
  + fn sale_price(price: i32) -> i32 {
• edit in exercises/functions/functions3.rs at line 3
  [2.131569]→[2.131569:131587](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/functions/functions3.rs at line 5
  [2.131600]→[2.131600:131615](∅→∅)
  − call_me();
  [2.131600]

  [2.131615]
  + call_me(0);
• edit in exercises/functions/functions2.rs at line 3
  [2.131846]→[2.131846:131864](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/functions/functions2.rs at line 8
  [2.131896]→[2.131896:131915](∅→∅)
  − fn call_me(num:) {
  [2.131896]

  [2.131915]
  + fn call_me(num: usize) {
• replacement in exercises/functions/functions1.rs at line 4
  [2.132121]→[2.132121:132138](∅→∅)
  − // I AM NOT DONE
  [2.132121]

  [2.132138]
  + fn call_me() {}