Find pair numbers those sum equal to K value

The function will receive an array and a K value. The function will find the pair numbers those sum equal to K value, and returns them as String.

Example [9, 6, 5, 7, 1, 3, 2, 4, 10, 8] K=16 returns "(9,7) (6,10)"

The output must be order of inputs order. 9 is at index 0 and 6 is at index 1.

Contributed by Emre Dipi