12: Improve solution for Rust track exercise "Nth Prime".

Dependencies

• [2] ERYD4CD7 11: Add solution for Rust track exercise "Nth Prime".
• [3] JZN2AQ3E 10: Add Rust track exercise "nth-prime".

Change contents

• replacement in rust/nth-prime/src/lib.rs at line 23
  [2.1210]→[2.1210:1239](∅→∅)
  − for index in 2..list_size {
  [2.1210]

  [2.1239]
  + for index in 2..limit {
• edit in rust/nth-prime/src/lib.rs at line 34
  [2.1520]

  [2.1520]
  + }

  + }

  + }

  +

  + for index in limit..list_size {

  + if list[index] {

  + count += 1;

  + if count > n {

  + // Might return incorrect value if values greater than u32::MAX are cast.

  + return index as u32;