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heres the instruction:
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in.

Note: If the number is a multiple of both 3 and 5, only count it once.

I got the output of 23 by adding all multiple of 3 and 5 but it saying, I'm wrong.

I'm new here plss help

function test() {
  var a = [];
  for (i=1; i<10; i++){
    if ((i%3==0) || (i%5==0)){
    a.push(i);
    }
  }
   return a;
}

function sum(number){ 
  var sum= 0;
  for(i=0; i<number.length; i++){
    sum += number[i];
    }
    return sum;
  }
var ab = test();
var abc = sum(ab);
console.log(abc);