merge

app/src/main/java/sudoku/io/SudokuPrinter.java

@@ -7,16 +7,16 @@ public class SudokuPrinter {
 	public static void printRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight) {
 		for (int y = 0; y < s.getSize(); y++) {
 			if (y % blockHeight == 0 && y > 0) {
-				System.out.println("");
+				System.out.println();
 			}
-			String line = "[ ";
+			StringBuilder line = new StringBuilder("[ ");
 			for (int x = 0; x < s.getSize(); x++) {
-				line += (s.getCell(x, y).getSymbolIndex() + 1) + " ";
+				line.append((s.getCell(x, y).getSymbolIndex() + 1)).append(" ");
 				if (x % blockWidth == blockWidth - 1 && x != blockWidth * blockHeight - 1) {
-					line += "| ";
+					line.append("| ");
 				}
 			}
-			line += "]";
+			line.append("]");
 			System.out.println(line);
 		}
 	}