Numerical calculation suggests that for prime $p\ge 5$,
\begin{align*}
\sum_{k=1}^{\frac{p-1}{2}}\frac{(-1)^k}{k}\sum_{i=\lfloor k/2\rfloor +1}^k\frac{1}{2i-1}\equiv 0\pmod{p}.
\end{align*}

>**Question.** How can we prove this congruence?