25: Refactor solution for Rust track exercise "Sum Of Multiples".

Dependencies

• [2] SPUEEQZQ 24: Add WIP solution for Rust track exercise "Sum Of Multiples".
• [3] QK6XE5XF 13: Add Rust track exercises "Beer Song", "Proverb", "Difference Of Squares", "Sum Of Multiples", "Grains", "Prime Factors", "Armstrong Numbers" and "Reverse String".

Change contents

• edit in rust/sum-of-multiples/src/lib.rs at line 239
  [2.5792]

  [2.5792]
  + let sum = CombinationsWithoutReplacement::new(factors, subset_size)?.fold(

  + 0,

  + |accumulator_b, combination| {

  + accumulator_b

  + + UnsignedMultiples::new(combination.iter().product(), limit).sum::<u32>()

  + },

  + );
• replacement in rust/sum-of-multiples/src/lib.rs at line 247
  [2.5824]→[2.5824:6090](∅→∅)
  − accumulator_a

  − + CombinationsWithoutReplacement::new(factors, subset_size)?.fold(

  − 0,

  − |accumulator_b, combination| {

  − accumulator_b

  − + UnsignedMultiples::new(combination.iter().product(), limit)

  − .sum::<u32>()

  − },

  − )
  [2.5824]

  [2.6090]
  + accumulator_a + sum
• replacement in rust/sum-of-multiples/src/lib.rs at line 249
  [2.6102]→[2.6102:6368](∅→∅)
  − accumulator_a

  − - CombinationsWithoutReplacement::new(factors, subset_size)?.fold(

  − 0,

  − |accumulator_b, combination| {

  − accumulator_b

  − + UnsignedMultiples::new(combination.iter().product(), limit)

  − .sum::<u32>()

  − },

  − )
  [2.6102]

  [2.6368]
  + accumulator_a - sum