Implement `int sqrt(int x)`. Compute and return the square root of *x*, where *x* is guaranteed to be a non-negative integer. Since the return type is an integer, the decimal digits are truncated and only the integer part of the result is returned. **Example 1:****Example 2:**
Explanation: The square root of 8 is 2.82842..., and since
the decimal part is truncated, 2 is returned.