Add implementations for moving all 'x' characters and removing duplicates from strings

Author: gourabofficial

Recursion/MoveAllXString.java

@@ -0,0 +1,23 @@
+public class MoveAllXString {
+    public static void main(String[] args) {
+        String str = "axbcxxd";
+        skip(0, "", str);
+        // Output: abcd
+        // Explanation: All 'x' characters are removed from the string.
+    }
+
+    static void skip(int index, String newStr, String str){
+        if(index == str.length()){
+            System.out.println(newStr);
+            return;
+        }
+
+        char currentChar = str.charAt(index);
+        if(currentChar == 'x'){
+                skip(index+1, newStr, str);
+        }else{
+            newStr +=currentChar;
+            skip(index+1, newStr, str);
+        }
+    }
+}

Recursion/RemoveDuplicatsString.java

@@ -0,0 +1,24 @@
+public class RemoveDuplicatsString {
+    public static void main(String[] args) {
+        String str = "abbccddeeffa";
+        removeDuplicatesFun(0, "", str);
+
+    }
+
+    static void removeDuplicatesFun(int index, String newStr, String str) {
+        if (index == str.length()) {
+            System.out.println(newStr);
+            return;
+        }
+
+        char currentChar = str.charAt(index);
+
+        if (newStr.indexOf(currentChar) != -1) {   // Character already exists - skip it (don't add duplicate)
+            removeDuplicatesFun(index + 1, newStr, str);
+        } else {
+            newStr += currentChar;
+            removeDuplicatesFun(index + 1, newStr, str);
+        }
+
+    }
+}