Mubashir needs your help to find next integral perfect square after the one passed as a parameter.
Create a function which takes a given number n and returns next integral perfect square number. Return null if the given number is not a perfect square.
nextSquare(121) ➞ 144
nextSquare(625) ➞ 676
nextSquare(114) ➞ null
// 114 is not a perfect square
N/A