38: Add solution for Rust track exercise "Reverse String".

Dependencies

• [2] QK6XE5XF 13: Add Rust track exercises "Beer Song", "Proverb", "Difference Of Squares", "Sum Of Multiples", "Grains", "Prime Factors", "Armstrong Numbers" and "Reverse String".

Change contents

• replacement in rust/reverse-string/tests/reverse-string.rs at line 12
  [2.6604]→[2.6604:6646](∅→∅)
  − assert_eq!(&reverse(input), expected)
  [2.6604]

  [2.6646]
  + assert_eq!(&reverse(input), expected)
• replacement in rust/reverse-string/tests/reverse-string.rs at line 18
  [2.6702]→[2.6702:6736](∅→∅)
  − process_reverse_case("", "");
  [2.6702]

  [2.6736]
  + process_reverse_case("", "");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 25
  [2.6787]→[2.6787:6831](∅→∅)
  − process_reverse_case("robot", "tobor");
  [2.6787]

  [2.6831]
  + process_reverse_case("robot", "tobor");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 32
  [2.6906]→[2.6906:6950](∅→∅)
  − process_reverse_case("Ramen", "nemaR");
  [2.6906]

  [2.6950]
  + process_reverse_case("Ramen", "nemaR");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 39
  [2.7043]→[2.7043:7099](∅→∅)
  − process_reverse_case("I'm hungry!", "!yrgnuh m'I");
  [2.7043]

  [2.7099]
  + process_reverse_case("I'm hungry!", "!yrgnuh m'I");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 46
  [2.7162]→[2.7162:7210](∅→∅)
  − process_reverse_case("racecar", "racecar");
  [2.7162]

  [2.7210]
  + process_reverse_case("racecar", "racecar");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 53
  [2.7285]→[2.7285:7331](∅→∅)
  − process_reverse_case("drawer", "reward");
  [2.7285]

  [2.7331]
  + process_reverse_case("drawer", "reward");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 60
  [2.7400]→[2.7400:7446](∅→∅)
  − process_reverse_case("子猫", "猫子");
  [2.7400]

  [2.7446]
  + process_reverse_case("子猫", "猫子");
• replacement in rust/reverse-string/tests/reverse-string.rs at line 68
  [2.7548]→[2.7548:7592](∅→∅)
  − process_reverse_case("uüu", "uüu");
  [2.7548]

  [2.7592]
  + process_reverse_case("uüu", "uüu");
• replacement in rust/reverse-string/src/lib.rs at line 2
  [2.7683]→[2.7683:7744](∅→∅)
  − unimplemented!("Write a function to reverse {}", input);
  [2.7683]

  [2.7744]
  + input.chars().rev().collect()