Update 0647-palindromic-substrings.java

Made the code more concise and readable.

Author: ColstonBod-oy

java/0647-palindromic-substrings.java

@@ -1,35 +1,26 @@
 class Solution {
-
     public int countSubstrings(String s) {
-        if (s.length() < 2) {
-            return s.length();
-        }
-        int result = 0;
+        int res = 0;
+
         for (int i = 0; i < s.length(); i++) {
-            // Odd Length
-            int left = i, right = i;
-            while (
-                left >= 0 &&
-                right < s.length() &&
-                s.charAt(left) == s.charAt(right)
-            ) {
-                result++;
-                left--;
-                right++;
-            }
-            // Even Length
-            left = i;
-            right = i + 1;
-            while (
-                left >= 0 &&
-                right < s.length() &&
-                s.charAt(left) == s.charAt(right)
-            ) {
-                result++;
-                left--;
-                right++;
-            }
+            res += countSubstrings(s, i, i);
+            res += countSubstrings(s, i, i + 1);
+        }
+
+        return res;
+    }
+
+    public int countSubstrings(String s, 
+                               int start, int end) {
+        int res = 0;
+    
+        while (start >= 0 && end < s.length() 
+               && s.charAt(start) == s.charAt(end)) {
+            ++res;
+            --start;
+            ++end;
         }
-        return result;
+
+        return res;
     }
 }