solves #3174: Clear Digits in java

Author: anishLearnsToCode

Diff for: README.md

@@ -915,7 +915,7 @@
 | 3158 | [Find the XOR of Numbers Which Appear Twice](https://leetcode.com/problems/find-the-xor-of-numbers-which-appear-twice)                                                 |                                                                             [![Java](assets/java.png)](src/FindTheXOROfNumbersWhichAppearTwice.java)                                                                             |                                                                                                                                   |
 | 3162 | [Find the Number of Good Pairs I](https://leetcode.com/problems/find-the-number-of-good-pairs-i)                                                                       |                                                                                  [![Java](assets/java.png)](src/FindTheNumberOfGoodPairsI.java)                                                                                  |                                                                                                                                   |
 | 3168 | [Minimum Number of Chairs in a Waiting Room](https://leetcode.com/problems/minimum-number-of-chairs-in-a-waiting-room)                                                 |                                                                             [![Java](assets/java.png)](src/MinimumNumberOfChairsInAWaitingRoom.java)                                                                             |                                                                                                                                   |
-| 3173 | [Bitwise OR of Adjacent Elements](https://leetcode.com/problems/bitwise-or-of-adjacent-elements)                                                                       |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 3173 | [Bitwise OR of Adjacent Elements](https://leetcode.com/problems/bitwise-or-of-adjacent-elements)                                                                       |                                                                                         [![Java](assets/java.png)](src/ClearDigits.java)                                                                                         |                                                                                                                                   |
 | 3174 | [Clear Digits](https://leetcode.com/problems/clear-digits)                                                                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 3178 | [Find the Child Who Has the Ball After K Seconds](https://leetcode.com/problems/find-the-child-who-has-the-ball-after-k-seconds)                                       |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 3184 | [Count Pairs That Form a Complete Day I](https://leetcode.com/problems/count-pairs-that-form-a-complete-day-i)                                                         |                                                                                                                                                                                                                                  |                                                                                                                                   |

Diff for: src/ClearDigits.java

@@ -0,0 +1,18 @@
+// https://leetcode.com/problems/clear-digits
+// T: O(N)
+// S: O(N)
+
+public class ClearDigits {
+    public String clearDigits(String s) {
+        final StringBuilder builder = new StringBuilder();
+        for (int i = 0, chars = 0, digits = 0 ; i < s.length() ; i++) {
+            if (Character.isDigit(s.charAt(i))) {
+                builder.deleteCharAt(builder.length() - 1);
+            } else {
+                builder.append(s.charAt(i));
+            }
+        }
+
+        return builder.toString();
+    }
+}