8: Improve solution for Rust track exercise "Raindrops".

Dependencies

• [2] N3POGH26 7: Add solution for Rust track exercise "Raindrops".
• [3] MSFESBT6 6: Add Rust track exercise "Raindrops".

Change contents

• replacement in rust/raindrops/src/lib.rs at line 2
  [3.1819]→[2.945:1046](∅→∅)
  − let a = move |b: u32| if b == 0 { false } else { n % b == 0 };

  − let (b, c, d) = (a(3), a(5), a(7));
  [3.1819]

  [2.1046]
  + let (a, b, mut c) = ("Pl", "ng", String::new());
• replacement in rust/raindrops/src/lib.rs at line 4
  [2.1047]→[2.1047:1201](∅→∅)
  − if b || c || d {

  − format!(

  − "{}{}{}",

  − if b { "Pling" } else { "" },

  − if c { "Plang" } else { "" },

  − if d { "Plong" } else { "" }

  − )

  − } else {
  [2.1047]

  [2.1201]
  + [(3, "i"), (5, "a"), (7, "o")].iter().for_each(|(d, e)| {

  + if n % d == 0 {

  + c.push_str(a);

  + c.push_str(e);

  + c.push_str(b)

  + }

  + });

  +

  + if c.is_empty() {
• edit in rust/raindrops/src/lib.rs at line 14
  [2.1217]

  [2.1217]
  + } else {

  + c