Strengths:

• The solution achieves O(n) time and O(1) space, which is optimal for this problem.
• The code is well-structured with a helper method for swapping.

Areas for Improvement:

• The condition in the while loop might be confusing. Consider using a more straightforward condition: while (nums[i] != i + 1 && nums[nums[i] - 1] != nums[i]) or simply while (nums[i] != i + 1) and then inside the loop, check if the target index already has the same value to avoid unnecessary swaps. This can prevent potential infinite loops.
• The code includes other methods that are not relevant to the problem. For clarity in a coding interview, it's better to submit only the solution for the problem at hand.
• Add comments to explain the approach, especially the while loop condition, to make it more understandable.

Overall, the solution is correct and efficient, but the while loop condition could be improved for clarity and safety.