improve -Implemented the roate algorithm using string.

Author: richie.p

rotate.py

@@ -0,0 +1,8 @@
+def rotate_string(sequence: str, value: int) -> str:
+    result = sequence + sequence
+
+    if value <= len(sequence):
+        return result[value:value+len(sequence)]
+    else:
+        return resut[value-len(sequence):value]
+