static void TestPrintColors()
    {
        string[] colors = new string[4] {"red", "blue", "green", "yellow"};
        string str = "Lorem ipsum dolor sit amet";
        PrintColors(colors, str);
    }

    static void PrintColors(string[] colors, string str)
    {
        char log;
        ConsoleColor originalColor = Console.ForegroundColor;
        int colorIndex = 0;
        ConsoleColor currentColor = originalColor;
        for (int i = 0; i < str.Length; i++)
        {
            log = str[i];

            if (log == ' ')
            {
                Console.WriteLine(log);
                continue;
            }

            switch(colors[colorIndex])
            {
                case "red":
                currentColor = ConsoleColor.Red;
                break;

                case "blue":
                currentColor = ConsoleColor.Blue;
                break;

                case "green":
                currentColor = ConsoleColor.Green;
                break;

                case "yellow":
                currentColor = ConsoleColor.Yellow;
                break;

                default:
                currentColor = originalColor;
                break;
            }

            colorIndex++;

            if (colorIndex >= colors.Length)
            {
                colorIndex = 0;
            }

            Console.ForegroundColor = currentColor;

            Console.WriteLine(log);
        }

        Console.ForegroundColor = originalColor;
    }

// before
string[] colors = new string[4] {"red", "blue", "green", "yellow"};


// after
string[] colors = new string[] {"red", "blue", "green", "yellow"};

// before
colorIndex++;

if (colorIndex >= colors.Length)
{
    colorIndex = 0;
}


// after
colorIndex = (colorIndex + 1) % colors.Length;

// before
for (int i = 0; i < str.Length; i++)
{
    log = str[i];


// after
foreach (char log in str)
{

// before
if (log == ' ')

// after
if (char.IsWhiteSpace(log))

// before
switch (colors[colorIndex])
{
    case "red":
        currentColor = ConsoleColor.Red;
        break;

    case "blue":
        currentColor = ConsoleColor.Blue;
        break;

    case "green":
        currentColor = ConsoleColor.Green;
        break;

    case "yellow":
        currentColor = ConsoleColor.Yellow;
        break;

    default:
        currentColor = originalColor;
        break;
}

// after
if (!Enum.TryParse(colors[colorIndex], true, out currentColor))
{
    currentColor = originalColor;
}