Added Reversing_String under Recursion

docs/Recursion/Reversing_String.md

@@ -0,0 +1,82 @@
+---
+id: reverse-string-recursion
+title: Reverse String Using Recursion
+sidebar_label: Reverse String
+description: "The Reverse String problem involves reversing a given string using a recursive function. The solution efficiently utilizes recursion to achieve the desired result without using any iterative constructs."
+tags: [reverse-string, recursion, dsa]
+---
+
+## Reverse String Using Recursion
+
+- Problem Statement: Given a string str, the task is to reverse the string using a recursive function. The function should return the reversed string as the output.
+
+
+- Expected Time Complexity: 𝑂(𝑛)
+
+- Expected Auxiliary Space: 𝑂(𝑛)
+
+### C++ Implementation
+
+```cpp
+#include <iostream>
+#include <string>
+using namespace std;
+
+class Solution {
+public:
+    string reverseString(string str) {
+        // Base case: If the string is empty or has only one character
+        if (str.length() <= 1) {
+            return str;
+        }
+        // Recursive case: Reverse the substring and append the first character at the end
+        return reverseString(str.substr(1)) + str[0];
+    }
+};
+
+int main() {
+    Solution solution;
+    string str = "hello";
+    cout << "Reversed string: " << solution.reverseString(str) << endl;
+    return 0;
+}
+``` 
+
+### Python Implementation
+
+```python
+class Solution:
+    def reverse_string(self, s: str) -> str:
+        # Base case: If the string is empty or has only one character
+        if len(s) <= 1:
+            return s
+        # Recursive case: Reverse the substring and append the first character at the end
+        return self.reverse_string(s[1:]) + s[0]
+
+# Example usage
+solution = Solution()
+s = "hello"
+print("Reversed string:", solution.reverse_string(s))
+
+```
+### Java Implementation
+
+```java
+
+public class Solution {
+    public String reverseString(String str) {
+        // Base case: If the string is empty or has only one character
+        if (str.length() <= 1) {
+            return str;
+        }
+        // Recursive case: Reverse the substring and append the first character at the end
+        return reverseString(str.substring(1)) + str.charAt(0);
+    }
+
+    public static void main(String[] args) {
+        Solution solution = new Solution();
+        String str = "hello";
+        System.out.println("Reversed string: " + solution.reverseString(str));
+    }
+}
+```