Modification of the String toString, make it easier

src/backend/Board.java

@@ -86,38 +86,40 @@ public class Board {
 	public String toString() {
 		StringBuilder sb = new StringBuilder();
 	    
-	    // Header (column labels)
+	    // Create a temporary grid representation
+	    char[][] grid = new char[lineNum][colNum];
+	    // Initialize grid with empty squares
+	    for (int y = 0; y < lineNum; y++) {
+	        for (int x = 0; x < colNum; x++) {
+	            grid[y][x] = '.';
+	        }
+	    }
+	    
+	    // Fill pieces into the grid
+	    for (Piece p : pieces) {
+	        int x = p.getX();
+	        int y = p.getY();
+	        if (x >= 0 && x < colNum && y >= 0 && y < lineNum) {
+	            grid[y][x] = getPieceSymbol(p);
+	        }
+	    }
+
+	    // Build header
 	    sb.append("  ");
 	    for (int x = 0; x < colNum; x++) {
-	        sb.append((char)('a' + x)).append(" ");
+	        sb.append((char) ('a' + x)).append(' ');
 	    }
-	    sb.append("\n");
+	    sb.append('\n');
 
-	    // Board rows (8 to 1, since chess starts from bottom)
+	    // Build board rows (top to bottom)
 	    for (int y = 0; y < lineNum; y++) {
-	        sb.append(lineNum - y).append(" "); // Row number (8 to 1)
-	        
+	        sb.append(lineNum - y).append(' ');
 	        for (int x = 0; x < colNum; x++) {
-	            boolean pieceFound = false;
-	            
-	            // Check if a piece exists at (x, y)
-	            for (Piece p : pieces) {
-	                if (p.getX() == x && p.getY() == y) {
-	                    char pieceChar = getPieceSymbol(p);
-	                    sb.append(pieceChar).append(" ");
-	                    pieceFound = true;
-	                    break;
-	                }
-	            }
-	            
-	            // If no piece, add a dot (.)
-	            if (!pieceFound) {
-	                sb.append(". ");
-	            }
+	            sb.append(grid[y][x]).append(' ');
 	        }
-	        sb.append("\n");
+	        sb.append('\n');
 	    }
-		//TODO
+
 	    return sb.toString();
 	}
 	// Helper method to convert Piece to symbol (e.g., 'K' for white king)