some move string manipulations

src/tools/types.py

@@ -13,8 +13,26 @@ class Integer(int):
 
 class String(str):
     def swap(self, x: int, y: int) -> String:
+        x, y = min(x, y), max(x, y)
         return String(self[:x] + self[y] + self[x + 1 : y] + self[x] + self[y + 1 :])
 
+    def rotate(self, n: int) -> String:
+        if n == 0:
+            return self
+        while n < 0:
+            n += len(self)
+        while n > len(self):
+            n -= len(self)
+        return String(self[-n:] + self[: len(self) - n])
+
+    def reverse(self, start: int = 0, end: int = None) -> String:
+        if end is None:
+            end = len(self) - 1
+        return String(self[:start] + "".join(reversed(self[start : end + 1])) + self[end + 1 :])
+
+    def __getitem__(self, item) -> String:
+        return String(super().__getitem__(item))
+
 
 class List(list):
     pass