Add structured Bug Report Issue Template (Fixes #6763)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,45 +1,60 @@
-name: "Bug report"
-description: "Create a report to help us improve"
-title: "[BUG] <title>"
+name: Bug Report
+description: Report an issue to help us improve
+title: "Provide a brief, clear description of the bug"
 labels: ["bug"]
+
 body:
-  - type: textarea
-    id: description
+  - type: input
+    id: summary
+    attributes:
+      label: Summary
+      description: Brief description of the issue.
+
+  - type: dropdown
+    id: environment
     attributes:
-      label: "Description"
-      description: "A clear and concise description of what the bug is."
-    validations:
-      required: true
+      label: Operating System
+      options:
+        - Windows
+        - macOS
+        - Linux
+        - Other
+
   - type: textarea
     id: steps
     attributes:
-      label: "Steps to reproduce"
-      description: "Steps to reproduce the behavior (if applicable)"
+      label: Steps to Reproduce
+      description: How can we reproduce this bug?
       placeholder: |
-       1. Go to '...'
-       2. Click on '....'
-       3. Scroll down to '....'
-       4. See error
-    validations:
-      required: false
+        1. Step one
+        2. Step two
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      placeholder: What should have happened?
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      placeholder: What actually happened?
+
   - type: textarea
-    id: exceptedbhv
+    id: logs
     attributes:
-      label: "Excepted behavior"
-      description: "A clear and concise description of what you expected to happen."
-    validations:
-      required: true
+      label: Logs / Error Messages
+      placeholder: Paste any relevant logs or screenshots.
+
   - type: textarea
-    id: screenshots
+    id: config
     attributes:
-      label: "Screenshots"
-      description: "If applicable, add screenshots to help explain your problem."
-    validations:
-      required: false
+      label: Configuration Files
+      description: VS Code settings.json / other configs if applicable.
+
   - type: textarea
     id: context
     attributes:
-      label: "Additional context"
-      description: "Is there anything else we should know about this bug report?"
-    validations:
-      required: false
+      label: Additional Context
+      placeholder: Any other info?

src/main/java/com/thealgorithms/ciphers/OneTimePadCipher.java

@@ -0,0 +1,39 @@
+package com.thealgorithms.ciphers;
+
+import java.security.SecureRandom;
+import java.util.Objects;
+
+public final class OneTimePadCipher {
+
+    private static final SecureRandom RANDOM = new SecureRandom();
+
+    private OneTimePadCipher() {}
+
+    public static byte[] generateKey(final int length) {
+        if (length <= 0) {
+            throw new IllegalArgumentException("Key length must be positive");
+        }
+        byte[] key = new byte[length];
+        RANDOM.nextBytes(key);
+        return key;
+    }
+
+    public static byte[] encrypt(final byte[] plaintext, final byte[] key) {
+        Objects.requireNonNull(plaintext, "plaintext");
+        Objects.requireNonNull(key, "key");
+
+        if (plaintext.length != key.length) {
+            throw new IllegalArgumentException("Plaintext and key must have the same length");
+        }
+
+        byte[] ciphertext = new byte[plaintext.length];
+        for (int i = 0; i < plaintext.length; i++) {
+            ciphertext[i] = (byte) (plaintext[i] ^ key[i]);
+        }
+        return ciphertext;
+    }
+
+    public static byte[] decrypt(final byte[] ciphertext, final byte[] key) {
+        return encrypt(ciphertext, key);
+    }
+}

src/test/java/com/thealgorithms/ciphers/OneTimePadCipherTest.java

@@ -0,0 +1,33 @@
+package com.thealgorithms.ciphers;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.nio.charset.StandardCharsets;
+import org.junit.jupiter.api.Test;
+
+public class OneTimePadCipherTest {
+
+    @Test
+    public void encryptDecryptWorks() {
+        String original = "OTP Test";
+        byte[] plaintext = original.getBytes(StandardCharsets.UTF_8);
+        byte[] key = OneTimePadCipher.generateKey(plaintext.length);
+
+        byte[] encrypted = OneTimePadCipher.encrypt(plaintext, key);
+        byte[] decrypted = OneTimePadCipher.decrypt(encrypted, key);
+
+        assertEquals(original, new String(decrypted, StandardCharsets.UTF_8));
+    }
+
+    @Test
+    public void throwsIfDifferentLength() {
+        byte[] plaintext = "Hi".getBytes(StandardCharsets.UTF_8);
+        byte[] key = new byte[] {1, 2, 3};
+
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> OneTimePadCipher.encrypt(plaintext, key)
+        );
+    }
+}