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

Dependencies

• [2] WQIAT4H6 9: Improve solution for Rust track exercise "Raindrops".
• [3] MBAFQOWX 8: Improve solution for Rust track exercise "Raindrops".
• [4] N3POGH26 7: Add solution for Rust track exercise "Raindrops".
• [5] MSFESBT6 6: Add Rust track exercise "Raindrops".

Change contents

• replacement in rust/raindrops/src/lib.rs at line 2
  [3.1819]→[2.0:28](∅→∅)
  − let (a, b) = ("Pl", "ng");
  [3.1819]

  [3.1046]
  + let (prefix, suffix, mut out) = ("Pl", "ng", String::with_capacity(15));
• replacement in rust/raindrops/src/lib.rs at line 4
  [3.1047]→[2.29:235](∅→∅)
  − let c =

  − [(3, "i"), (5, "a"), (7, "o")]

  − .iter()

  − .fold(String::with_capacity(15), |mut d, (e, f)| {

  − if n % e == 0 {

  − d.push_str(a);

  − d.push_str(f);

  − d.push_str(b);

  − }

  − d

  − });
  [3.1047]

  [3.190]
  + [(3, "i"), (5, "a"), (7, "o")]

  + .iter()

  + .for_each(|(factor, vowel)| {

  + if n % factor == 0 {

  + out.push_str(prefix);

  + out.push_str(vowel);

  + out.push_str(suffix)

  + }

  + });
• replacement in rust/raindrops/src/lib.rs at line 14
  [3.191]→[3.191:210](∅→∅)
  − if c.is_empty() {
  [3.191]

  [3.1201]
  + if out.is_empty() {
• replacement in rust/raindrops/src/lib.rs at line 17
  [3.221]→[3.221:225](∅→∅)
  − c
  [3.221]

  [3.1217]
  + out