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

You are given two strings s1 and s2 of equal length. A string swap is an operation where you choose two indices in a string (not necessarily different) and swap the characters at these indices.
Return true if it is possible to make both strings equal by performing at most one string swap on exactly one of the strings. Otherwise, return false.
 
Please complete the following python code precisely:
```python
class Solution:
    def areAlmostEqual(self, s1: str, s2: str) -> bool:
```