What's wrong with my code?

I am coding a battleship game that uses a dpad using C on an arduino mega which is connected to a screen. I noticed that something is missing from my code but I can't figure out what it is and why battleship is not running. For context, we have two buttons: one for select and one for deselect. I need that incorporated as well. I know that I'm missing the actual game logic and some of the actual stuff so if someone could edit it a bit for me and add that stuff in that would be great so that it can be a playable game.

#include

// Define the TFT display object

TFT_eSPI tft = TFT_eSPI();

// Define the dpad pins

#define UP_PIN 2

#define DOWN_PIN 3

#define LEFT_PIN 4

#define RIGHT_PIN 5

#define CONFIRM_PIN 6

#define SELECT_PIN 7

#define DESELECT_PIN 8

// Define the grid size

const int GRID_SIZE = 10;

// Define the ship lengths

const int SHIP_LENGTHS[] = {1, 2, 3, 4};

// Define the player grids

int player1Grid[GRID_SIZE][GRID_SIZE];

int player2Grid[GRID_SIZE][GRID_SIZE];

// Define the current player and ship length

int currentPlayer = 1;

int currentShipLength = 1;

// Define the ship placement position

int shipRow = 0;

int shipCol = 0;

int shipDirection = 0; // 0 = horizontal, 1 = vertical

// Function to initialize the game

void initializeGame() {

// Clear the player grids

memset(player1Grid, 0, sizeof(player1Grid));

memset(player2Grid, 0, sizeof(player2Grid));

// Set the current player and ship length

currentPlayer = 1;

currentShipLength = 1;

// Set the initial ship placement position

shipRow = 0;

shipCol = 0;

shipDirection = 0;

// Draw the player grids

tft.fillScreen(TFT_BLACK);

tft.drawRect(0, 0, tft.width() / 2 - 1, tft.height() - 1, TFT_WHITE);

tft.drawRect(tft.width() / 2, 0, tft.width() / 2 - 1, tft.height() - 1, TFT_WHITE);

// Draw the current ship

tft.drawRect(tft.width() / 2 + shipCol * 20, shipRow * 20, currentShipLength * 20 - 1, 19, TFT_WHITE);

}

// Function to update the ship placement position

void updateShipPosition(int direction) {

// Calculate the new ship position

int newRow = shipRow;

int newCol = shipCol;

if (direction == 0) { // up

newRow--;

} else if (direction == 1) { // down

newRow++;

} else if (direction == 2) { // left

newCol--;

} else if (direction == 3) { // right

newCol++;

}

// Check if the new position is valid

if (newRow >= 0 && newRow < GRID_SIZE && newCol >= 0 && newCol < GRID_SIZE - currentShipLength + 1) {

// Erase the current ship

tft.drawRect(tft.width() / 2 + shipCol * 20, shipRow * 20, currentShipLength * 20 - 1, 19, TFT_BLACK);

// Update the ship position

shipRow = newRow;

shipCol = newCol;

// Draw the current ship

tft.drawRect(tft.width() / 2 + shipCol * 20, shipRow * 20, currentShipLength * 20 - 1, 19, TFT_WHITE);

}

}

// Function to update the ship placement direction

void updateShipDirection() {

// check if the "right" button is pressed

if (digitalRead(RIGHT_BUTTON_PIN) == LOW) {

// increment the ship direction

shipDirection++;

// wrap the direction around if it goes past 3

if (shipDirection > 3) {

shipDirection = 0;

}

// draw the ship in the new direction

drawShip(shipX, shipY, shipLength, shipDirection);

}

// check if the "left" button is pressed

else if (digitalRead(LEFT_BUTTON_PIN) == LOW) {

// decrement the ship direction

shipDirection--;

// wrap the direction around if it goes below 0

if (shipDirection < 0) {

shipDirection = 3;

}

// draw the ship in the new direction

drawShip(shipX, shipY, shipLength, shipDirection);

}

}