Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given two strings s and goal, return true if and only if s can become goal after some number of shifts on s.
A shift on s consists of moving the leftmost character of s to the rightmost position.

For example, if s = "abcde", then it will be "bcdea" after one shift.

 
Please complete the following python code precisely:
```python
class Solution:
    def rotateString(self, s: str, goal: str) -> bool:
```