export function prefixSum(nums: number[]): number[] {
  const prefixSumResult = [...nums]

  nums.forEach((currentNumber, i)=>{

    let previousNumber = 0
    if(i > 0){
      previousNumber = prefixSumResult[i -1];
    }

    prefixSumResult[i] = previousNumber + currentNumber
  })
  
  return prefixSumResult;
}