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

Dependencies

• [2] QGB53CNE 14: Improve solution for Rust track exercise "Raindrops".
• [3] MBAFQOWX 8: Improve solution for Rust track exercise "Raindrops".
• [4] MSFESBT6 6: Add Rust track exercise "Raindrops".
• [5] N3POGH26 7: Add solution for Rust track exercise "Raindrops".
• [6] WQIAT4H6 9: Improve solution for Rust track exercise "Raindrops".

Change contents

• replacement in rust/raindrops/src/lib.rs at line 2
  [3.1819]→[2.0:74](∅→∅)
  − let (prefix, suffix, mut out) = ("Pl", "ng", String::with_capacity(15));
  [3.1819]

  [3.1046]
  + let mut out = String::with_capacity(15);
• replacement in rust/raindrops/src/lib.rs at line 8
  [2.173]→[2.173:199](∅→∅)
  − out.push_str(prefix);
  [2.173]

  [2.199]
  + out.push_str("Pl");
• replacement in rust/raindrops/src/lib.rs at line 10
  [2.224]→[2.224:249](∅→∅)
  − out.push_str(suffix)
  [2.224]

  [2.249]
  + out.push_str("ng")