solves remove outermost parantheses

Author: anishLearnsToCode

README.md

@@ -275,7 +275,7 @@
 | 1010 | [Pairs of Songs With Total Durations Divisible by 60](https://leetcode.com/problems/pairs-of-songs-with-total-durations-divisible-by-60)             |                                                [![Java](assets/java.png)](src/PartitionArrayIntoThreePartsWithEqualSum.java)                                                |                                                                                                                                   |
 | 1013 | [Partition Array into Three Parts with equal Sum](https://leetcode.com/problems/partition-array-into-three-parts-with-equal-sum)                     |                                                                                                                                                                             |                                                                                                                                   |
 | 1018 | [Binary Prefix Divisible by 5](https://leetcode.com/problems/binary-prefix-divisible-by-5)                                                           |                                                        [![Java](assets/java.png)](src/BinaryPrefixDivisibleBy5.java)                                                        |                                                                                                                                   |
-| 1021 | [Remove Outermost Parenthesis](https://leetcode.com/problems/remove-outermost-parentheses)                                                           |                                                                                                                                                                             |                                                                                                                                   |
+| 1021 | [Remove Outermost Parenthesis](https://leetcode.com/problems/remove-outermost-parentheses)                                                           |                                                       [![Java](assets/java.png)](src/RemoveOutermostParentheses.java)                                                       |                                                                                                                                   |
 | 1022 | [Sum of Root to Leaf Binary Numbers](https://leetcode.com/problems/sum-of-root-to-leaf-binary-numbers)                                               |                                                                                                                                                                             |                                                                                                                                   |
 | 1025 | [Divisor Game](https://leetcode.com/problems/divisor-game)                                                                                           |                                                                                                                                                                             |                                                                                                                                   |
 | 1029 | [Two City Scheduling](https://leetcode.com/problems/two-city-scheduling)                                                                             |                                                                                                                                                                             |                                                                                                                                   |

src/RemoveOutermostParentheses.java

@@ -0,0 +1,13 @@
+public class RemoveOutermostParentheses {
+    public String removeOuterParentheses(String s) {
+        StringBuilder result = new StringBuilder();
+        for (int index = 0, level = 0 ; index < s.length() ; index++) {
+            if (level != 0 && (level != -1 || s.charAt(index) != ')')) {
+                result.append(s.charAt(index));
+            }
+            if (s.charAt(index) == '(') level--;
+            else level++;
+        }
+        return result.toString();
+    }
+}