CW encoder for Arduino

//////////////////////////////////////
// MADE BY SHARPY NIORO && SUNSHINE //
//////////////////////////////////////
//        JUST FOR LULZ [c]         //
//////////////////////////////////////

unsigned long dahLen;
String code, string; // THE CODE OF LAST CHAR AND STRING OF CHARS YOU'VE ENTERED

void setup() {
 dahLen = 250; // LENGTH OF DAH IN MS
 Serial.begin(9600); // BEGINS THE MONOLOGUE
 pinMode(13, OUTPUT); // PREPARES THE LED TO BE USED
 pinMode(9, OUTPUT); // PREPARES THE SPEAKER TO MAKE THE 'BEEEEE' SOUNDS
}

void loop() // STARTS THE LOOP
{
  if (Serial.available() > 0) // IF SOMETHING NEW IN SERIAL MONITOR (SM)
  {
    string = Serial.readString(); // READS WHAT YOU'VE ENTERED
    string.toUpperCase(); // FEEDS THE LETTERS TO MAKE THEM BIGGER
    convert(); // SUMMONS THE ANGELS TO ENCODE THE MORSE
  }
}

void convert()
{
  static String letters[] = {".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-",
                             ".-.", "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..", ".-.-.-", "--..--", "-----", ".----", "..---", "...--",
                             "....-", ".....", "-....", "--...", "---..", "----.", "---.", "..--..", ".--.-.", "---...", ".----.", "-....-", "-..-.",
                             ".-..-.", "-...-"
                            }; // ARRAY OF MORSE
  static char Alphabet[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '.', ',',
                            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '!', '?', '@', ':', '\'', '-', '/', '"', '=', ' ', ']'
                           }; // ARRAY OF ENGLISH CHARS
  int i = 0, i2 = 0; // SET THE indexes TO 0
  while (i2 != string.length()) // WHILE THERE ARE CHARACTERS IN YOUR STRING
  {
    while (Alphabet[i] != ']') // WHILE NOT ARRAY ENDED [COULD BE MADE A LOT BETTER BUT I DON'T HAVE A TIME]
    {
      if (Alphabet[i] == string[i2]) // IF CURRENT LETTER FOUND IN THE ARRAY
      {
        code = letters[i]; // ASSIGNS THE CODE FOR THE CURRENT LETTER
        play(string[i2 + 1] == ' '); // PLAYES THE 'BEE' SOUND
        i = 0;
        break;
      }
      i++; // GROW UP
    }
    code = ""; // RESETS THE code VALUE
    i2++; // GROW UP SEQUEL
  }
  Serial.println(); // BREAKS THE LINE
  string = ""; // KILLS THE STRING
}

void playUnit(bool dah)
{
  tone(9, 400); // BEATS THE SPEAKER WITH ELECTRICITY TO MAKE IT MAKE THE 'BEEE' SOUND
  delay(dah ? dahLen : dahLen/3); // WAITS FOR THE TIME WHEN YOU'LL FIND THE GIRLFRIEND [FOREVER]
  noTone(9); // SHUTS UP THE SPEAKER
}
void play(bool eow)
{
  int i = 0; // RESETS THE index
  while (i != code.length()) // WHILE THERE ARE SOME CHARS IN CODE
  {
    if(code[i] == '-') // IF DAH...
      Serial.print("-"); // ...PRINT DAH
    else // IF NOT
      Serial.print("."); // PRINT NOT
    playUnit(code[i] == '-'); // STARTS THE TORTURE FOR THE SPEAKER
    if(i != (code.length() - 1)) // IF THIS IS NOT THE END
      delay(dahLen/3); // WAIT ONE TIME UNIT
    i++; // GROW UP
  }
  if(!eow) // IF NOT THE END OF THE WORLD (eow)...
  {
    Serial.print(" "); // ...PRINT THE SPACE AND TIME MAP
    delay(dahLen); // ...WAIT
  }
  else // IF THE eow IS NEAR...
  {
    Serial.print(" /"); // ...PRINTS THE /
    delay((dahLen/3)*7); // ...WAITS FOR THE SEVEN WONDERS TO BE BUILT
  }
}