const arr3 = [];
  const length1= arr1.length;
  const length2 = arr2.length;
  let k = 0;
  const totalLength = length1 + length2;
  for(let i=0 ; i<=totalLength; i++){
      arr3.push(arr1[i]);
       if(i > length1){
        arr3.push(arr2[k]);
         k= k+1;
         }
  }
  return arr3;
}

merge([1,3,25,5], [5,4,9,7]); ```

i am getting an output