1) plus minus - remove code smell

Author: Jakub Jirous

src/challenges/01-plus-minus/plus-minus.ts

@@ -38,7 +38,7 @@ export const plusMinus = (inputArray: number[]): string => {
  [0, 0, 0]
  )
  .reduce(
- (acc, value) => (acc += `${(value / inputArray.length).toFixed(6)}\n`),
+ (acc, value) => acc + `${(value / inputArray.length).toFixed(6)}\n`,
  ""
  );
 };