28: Add missing semicolon in solution for Rust track exercise "Raindrops".

Dependencies

• [2] SGDHLMNR 27: Improve solution for Rust track exercise "Raindrops".
• [3] QGB53CNE 14: Improve solution for Rust track exercise "Raindrops".
• [*] MSFESBT6 6: Add Rust track exercise "Raindrops".

Change contents

• replacement in rust/raindrops/src/lib.rs at line 10
  [3.224]→[2.68:91](∅→∅)
  − out.push_str("ng")
  [3.224]

  [3.249]
  + out.push_str("ng");