Arduino text to morse code using LED

/* This program translates characters and full strings into blinking morse code on the Duinobot LED*/

/* Some constants that will never change for the purpose of this exercise.*/
const int ledPin = 13;
const int dotDelay = 250;
const int dashDelay = 3*dotDelay;

/* Setup led pin and Serial console at 9600baud*/
void setup()
{

  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);

}
/* Shows a dotDelay with proper delay using LED*/
void show_dot()
{
    digitalWrite(ledPin,HIGH);
    delay(dotDelay);
    digitalWrite(ledPin,LOW);
    delay(dotDelay);
}
/* Shows a dashDelay with proper delay using LED*/
void show_dash()
{
    digitalWrite(ledPin,HIGH);
    delay(dashDelay);
    digitalWrite(ledPin,LOW);
    delay(dotDelay);
}

/* Function for blinking based on letters, accepts one character to keep things simple.*/
void blink(char ch)
{
    /* Switch statement with case for each letter to blink*/
    switch(ch)
    {
        case 'a':
            show_dot();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'b':
            show_dash();
            show_dot();
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'c':
            show_dash();
            show_dot();
            show_dash();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'd':
            show_dash();
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'e':
            show_dot();
            delay (2*dotDelay);
            break;
        case 'f':
            show_dot();
            show_dot();
            show_dash();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'g':
            show_dash();
            show_dash();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'h':
            show_dot();
            show_dot();
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'i':
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'j':
            show_dot();
            show_dash();
            show_dash();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'k':
            show_dash();
            show_dot();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'l':
            show_dot();
            show_dash();
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'm':
            show_dash();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'n':
            show_dash();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'o':
            show_dash();
            show_dash();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'p':
            show_dot();
            show_dash();
            show_dash();
            show_dot();
            delay (2*dotDelay);
            break;
        case 'q':
            show_dash();
            show_dash();
            show_dot();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'r':
            show_dot();
            show_dash();
            show_dot();
            delay (2*dotDelay);
            break;
        case 's':
            show_dot();
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        case 't':
            show_dash();
            delay (2*dotDelay);
            break;
        case 'u':
            show_dot();
            show_dot();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'v':
            show_dot();
            show_dot();
            show_dot();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'w':
            show_dot();
            show_dash();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'x':
            show_dash();
            show_dot();
            show_dot();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'y':
            show_dash();
            show_dot();
            show_dash();
            show_dash();
            delay (2*dotDelay);
            break;
        case 'z':
            show_dash();
            show_dash();
            show_dot();
            show_dot();
            delay (2*dotDelay);
            break;
        /* delay for space (new word)*/
        case ' ':
            delay(6*dotDelay);
            Serial.println("DEBUG: Delay due to new word");
            break;
    }
}
void blinkString(String s)
{
    /* Blink a string by indexing each letter into a single character and sending it to the blink function*/
    s.toLowerCase();
    for (int x = 0; x < s.length(); x++)
    {
        blink((char)s[x]);
        Serial.print ("DEBUG: Blinked a \"");
        Serial.print((char)s[x]);
        Serial.print("\"");
        Serial.println();
    }
}



void loop()
{
    blinkString("ayy lmao");
    delay(6*dotDelay);
    Serial.println("DEBUG: Repeat loop");

    return;
}