feat: add Caesar Cipher

Author: eneskaya12

README.md

@@ -63,4 +63,5 @@
 | 059 | [Strange Counter](https://www.hackerrank.com/challenges/strange-code/problem?isFullScreen=true)                               | [StrangeCounter.js](./solutions-of-algorithms/StrangeCounter.js)                      |
 | 060 | [Strong Password](https://www.hackerrank.com/challenges/strong-password/problem?isFullScreen=true)                            | [StrongPassword.js](./solutions-of-algorithms/StrongPassword.js)                      |
 | 061 | [Flatland Space Stations](https://www.hackerrank.com/challenges/flatland-space-stations/problem?isFullScreen=true)            | [FlatlandSpaceStations.js](./solutions-of-algorithms/FlatlandSpaceStations.js)        |
-| 062 | [Insertion Sort - Part 2](https://www.hackerrank.com/challenges/insertionsort2/problem?isFullScreen=true)                     | [InsertionSort-Part2.js](./solutions-of-algorithms/InsertionSort-Part2.js)            |
+| 062 | [Insertion Sort - Part 2](https://www.hackerrank.com/challenges/insertionsort2/problem?isFullScreen=true)                     | [InsertionSort-Part2.js](./solutions-of-algorithms/InsertionSort-Part2.js)            |
+| 063 | [Caesar Cipher](https://www.hackerrank.com/challenges/caesar-cipher-1/problem?isFullScreen=true)                              | [CaesarCipher.js](./solutions-of-algorithms/CaesarCipher.js)                          |

solutions-of-algorithms/CaesarCipher.js

@@ -0,0 +1,26 @@
+function caesarCipher(s, k) {
+    
+    let alphabet = "abcdefghijklmnopqrstuvwxyz";
+    let ucAlphabet = alphabet.toUpperCase();
+    let result = [];
+    for (let key of s) {
+        if (ucAlphabet.includes(key)) {
+            let a = ucAlphabet.indexOf(key);
+            if ((a + k) >= ucAlphabet.length) {
+                result.push(ucAlphabet[((a + k) % 26)]);
+            } else {
+                result.push(ucAlphabet[a + k]);
+            }
+        } else if (alphabet.includes(key)) {
+            let a = alphabet.indexOf(key);
+            if ((a + k) >= alphabet.length) {
+                result.push(alphabet[((a + k) % 26)]);
+            } else {
+                result.push(alphabet[a + k]);
+            }
+        } else {
+            result.push(key);
+        }
+    }
+    return result.join('');
+}