rotate string (right shift simple algorithm) implementation

strings/rotate_string.dart

@@ -0,0 +1,31 @@
+// leetcode problem : https://leetcode.com/problems/rotate-string
+
+class Solution {
+  bool rotateString(String s, String goal) {
+    int m = s.length;
+    int n = goal.length;
+
+    if (m != n) return false;
+
+    for (int i = 0; i < m; i++) {
+      s = s.substring(1) + s[0];
+      if (s == goal) return true;
+    }
+    return false;
+  }
+}
+
+void main() {
+  Solution solution = Solution();
+
+  // Test case
+  String s = "abcde";
+  String goal = "cdeab";
+
+  bool result = solution.rotateString(s, goal);
+
+  print("Input:");
+  print("s = \"$s\"");
+  print("goal = \"$goal\"");
+  print("Output: $result");
+}