Diamond kata NewDay interview Test -added 3 files

Diamond Kata/Diamond.java

@@ -0,0 +1,52 @@
+//NewDay CodeDojos/Diamond Kata
+
+package newday.test.diamond;
+
+public class Diamond {
+    public static String create(char letter) {
+        if (letter < 'A' || letter > 'Z') {
+            return "Invalid input. Please provide a letter between A and Z.";
+        }
+
+        StringBuilder result = new StringBuilder();
+
+        // Print the top half of the diamond
+        result.append(createLine(letter, 'A'));
+        for (char current = 'B'; current <= letter; current++) {
+            result.append(createLine(letter, current));
+        }
+
+        // Print the bottom half of the diamond
+        for (char current = (char)(letter - 1); current >= 'A'; current--) {
+            result.append(createLine(letter, current));
+        }
+
+        return result.toString();
+    }
+
+    private static String createLine(char letter, char current) {
+        StringBuilder line = new StringBuilder();
+
+        // Leading spaces
+        for (char c = current; c < letter; c++) {
+            line.append(" ");
+        }
+
+        // Current character
+        line.append(current);
+
+        // Special handling for characters after 'A'
+        if (current != 'A') {
+            int spaces = (current - 'A') * 2 - 1;
+            for (int i = 0; i < spaces; i++) {
+                line.append(" ");
+            }
+            line.append(current);
+        }
+
+        // Newline
+        line.append("\n");
+
+        return line.toString();
+    }
+}

Diamond Kata/DiamondPrinterTest.java

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+package newday.test.diamond;
+
+
+
+	import static org.junit.Assert.assertEquals;
+	import org.junit.Test;
+
+	public class DiamondPrinterTest {
+
+		 @Test
+		    public void testCreateDiamondA() {
+		        assertEquals("A\n", Diamond.create('A'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondBCharacterSequence() {
+		        assertEquals("AB\n", Diamond.create('B'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondBRepeatCharacters() {
+		        assertEquals("ABB\n", Diamond.create('B'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondBSeparateLines() {
+		        assertEquals("A\nBB\n", Diamond.create('B'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondBIndentation() {
+		        assertEquals(" A\nB B\n A\n", Diamond.create('B'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondBInterCharacterSpaces() {
+		        assertEquals(" A\nB B\n A\n", Diamond.create('B'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondBSymmetry() {
+		        assertEquals(" A\nB B\n A\n", Diamond.create('B'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondC() {
+		        assertEquals("  A\n B B\nC   C\n B B\n  A\n", Diamond.create('C'));
+		    }
+
+		    @Test
+		    public void testCreateDiamondD() {
+		        assertEquals("   A\n  B B\n C   C\nD     D\n C   C\n  B B\n   A\n", Diamond.create('D'));
+		    }
+
+		    // Add more test cases as needed to cover additional scenarios
+		}

Diamond Kata/DiamondTest.java

@@ -0,0 +1,16 @@
+package newday.test.diamond;
+
+public class DiamondTest {
+
+    public static void main(String[] args) {
+        // Test with different characters
+        System.out.println("Diamond for character 'A':");
+        System.out.println(Diamond.create('A'));
+
+        System.out.println("Diamond for character 'B':");
+        System.out.println(Diamond.create('B'));
+
+        System.out.println("Diamond for character 'C':");
+        System.out.println(Diamond.create('D'));
+    }
+}