Merge pull request DaleStudy#2120 from Sol35229/main

[Sol35229] WEEK 03 solutions

Author: Sol35229

valid-palindrome/Sol35229.java

@@ -0,0 +1,24 @@
+import java.util.Stack;
+
+public class Sol35229 {
+
+    class Solution {
+        public boolean isPalindrome(String s) {
+            s = s.toLowerCase().replaceAll("[^a-z0-9]", "");
+            int left = 0;
+            int right = s.length() - 1;
+            while (left < right) {
+                if (s.charAt(left) != s.charAt(right)) {
+                    return false;
+                }
+                left++;
+                right--;
+            }
+            return true;
+        }
+//        boolean isLowerCase(Character c) {
+//            return (int) c > 96 && (int) c < 123 ? true : false;
+//        }
+    }
+}
+