Added 13 solutions

Algorithms/Strings/Caesar Cipher/Solution.java

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+//     Author: Rodney Shaghoulian
+//     Github: github.com/rshaghoulian
+// HackerRank: hackerrank.com/rshaghoulian
+
+import java.util.Scanner;
+
+public class Solution {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        int length = scan.nextInt();
+        String str = scan.next();
+        int K      = scan.nextInt();
+        scan.close();
+        
+        StringBuilder sb = new StringBuilder();
+        
+        for (int i = 0; i < length; i++) {
+            char ch = str.charAt(i);
+            sb.append(encrypt(ch, K));
+        }
+        
+        System.out.println(sb);
+    }
+    
+    /* Encrypts a character using Caesar Cipher */
+    private static char encrypt(char ch, int K) {
+        if (!Character.isLetter(ch)) {
+            return ch;
+        }
+        char base = Character.isLowerCase(ch) ? 'a' : 'A';
+        return (char) ((ch - base + K) % 26 + base);
+    }
+}