public static int[] Task(int[] arr1, int start, int end){
    int[] returnArray = new int[arr1.Length];
    int counter = 0;
    for(int i = 0; i<arr1.Length;i++){
      if(arr1[i]<=end && arr1[i]>=start){
        returnArray[counter] = arr1[i];
        counter++;
      }
    }
    return returnArray;
  }