What exactly is the suggestion here? What needs to be changed in the code of the kata?

RISC-V srli Implementation Issue: It turn out not to be logical shift

If you're getting incorrect results with large inputs (especially numbers > 2^31), check your srli (Shift Right Logical Immediate) results. Some implementations might incorrectly perform arithmetic right shift instead of logical right shift.
Example of the issue:
Input: 3435973832

Correct srli result (input >> 3): 429496729
Incorrect result seen: 4187593113 (arithmetic shift behavior)

Brute Solution: Mask the result after shift to ensure upper bits are zero:

This issue particularly affects calculations involving division by powers of 2 using right shifts on large unsigned numbers.