Ever wondered how many changes are required to match 2 halves of one string?

• provided string must be a multiple of 2
• might not cover all duplicate scenarios
• unit tests supported by https://jestjs.io/
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes

134157 (there's an even split of string)

52825 (there is no 'middle' to split evently into 2 halves)

Need to improve logic to factor in duplicate values. E.g this array [3,4,5,3,5,4,3,5] needs 1 change however the current implementation is returning 0.