Benchmarking - Insert prealloc slice.go

// insertXPreallocIntSlice is used to add X amount of items into a []int
func insertXPreallocIntSlice(x int, b *testing.B) {
	// Initalize a Slice and insert X amount of Items
	testSlice := make([]int, x)
	// reset timer
	b.ResetTimer()
	for i := 0; i < x; i++ {
		testSlice[i] = i
	}
}