def reverse_string(s): return s[::-1]

As an AI language model, I do not have the context to identify the problem this code is trying to solve. However, I can tell you that this function takes a string as an argument and returns the reversed version of that string using the slicing technique in Python.

In Python, strings can be sliced using the syntax s[start:stop:step], where start is the starting index of the slice, stop is the stopping index of the slice, and step is the step size for the slice. If any of these values are not specified, they default to their default values, which are 0 for start, len(s) for stop, and 1 for step.

In this function, the slicing syntax s[::-1] is used to reverse the string. The start and stop values are omitted, which means the slice will start from the beginning and go all the way to the end of the string. The step value is -1, which means the slice will go from the end of the string to the beginning, effectively reversing the string.