Removing extra space from table with multirow and multicolumn

Question

I am getting extra space in the first three rows which I do not want. How to remove this extra space?

\begin{table}[h]
\begin{center}
    \begin{tabular}{l c c c c c c c}    
    \hline \hline
    \multicolumn{8}{l}{}   \\ 
    Cases &  Left & Right & Below & Above & Numbers & Sum & Framework        \\
    \hline\hline
        \multicolumn{8}{l}{}   \\                             Case I       & \ding{55}& \checkmark& 0/$\pi$& 0  &0  & 0.1408-0.1496 & 0.057-0.059                   \\
        \hline
        \multicolumn{8}{l}{}    \\                           Case II  & \ding{55} & \checkmark& 0/$\pi$ &0-2$\pi$ & 0 & 0.1408-0.1496& 0.019-0.054                \\
        \hline
        \multirow{2}{*}{Case III} & \multirow{2}{*}{\checkmark} & \multirow{2}{*}{\ding{55}} & 0-0.78 & \multirow{2}{*}{-2.362$-$1.26} & \multirow{2}{*}{0.61-1.20} & \multirow{2}{*}{0.0773-0.1231} & \multirow{2}{*}{0.0059-0.026} \\ 
        &                   &                   & 3.14-3.66 &                   &                   &                   &                  \\ \hline
        \multirow{2}{*}{Case IV} & \multirow{2}{*}{\checkmark} & \multirow{2}{*}{\ding{55}} &0-0.78  & \multirow{2}{*}{0.60-1.84} & \multirow{2}{*}{0.61-1.20} & \multirow{2}{*}{0.0773-0.1231} & \multirow{2}{*}{0.013-0.025} \\
        &                   &                   & 3.14-3.66 &                   &                   &                   &                   \\
        \hline
        \multirow{2}{*}{General Case} & \multirow{2}{*}{\checkmark} & \multirow{2}{*}{\ding{55}} &-1.5-0.6  & \multirow{2}{*}{-3-3} & \multirow{2}{*}{-2.85-1.13} & \multirow{2}{*}{0.06-1.12} & \multirow{2}{*}{0.001-0.03} \\
        &                   &                   & 1.38-1.57 &                   &                   &                   &                   \\
        \hline
        \multirow{2}{*}{General Case} & \multirow{2}{*}{\ding{55}} & \multirow{2}{*}{\checkmark} & -1.5-0.6 & \multirow{2}{*}{-3-3} &    -1.5$-$0.01               & \multirow{2}{*}{0.115-0.15} & \multirow{2}{*}{0.016-0.06} \\
        &                   &                   & 0.8-1.56 &                   &                   1.33-1.7&                   &             \\
        \hline
    \end{tabular}
    \caption{Summary of the analysis.}\label{tab:summary}
    \end{center}
\end{table}

Answer 1

I would like to show you a solution with tabularray:

\documentclass{article}
\usepackage{geometry}
\usepackage{tabularray}
\usepackage{pifont}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
\begin{table}[h]\small\centering% see https://tex.stackexchange.com/questions/23650/when-should-we-use-begincenter-instead-of-centering?rq=1
\begin{tblr}{
    colspec={lcc*5{rcl}},
    cell{2-Z}{4-Z}={mode=math},
    cell{1}{5,8,11,14,17}={cmd=\makebox[0pt]},
    cell{2}{5,8,11}={cmd=\makebox[0pt]},
    cell{3}{5,11}={cmd=\makebox[0pt]},
    cell{4-Z}{5}={preto=\text{--}},
    cell{3,4,6,8,10}{8}={preto=\text{--}},
    cell{4,6,8,10,11}{11}={preto=\text{--}},
    cell{2-4,6,8,10}{14,17}={preto=\text{--}},
    cell{4,6,8,10}{1}={r=2}{l},
    cell{4,6,8,10}{7,13,16}={r=2}{r},
    cell{4,6,8,10}{2,3,8,14,17}={r=2}{c},
    cell{4,6,8,10}{9,15,18}={r=2}{l},
    cell{4,6,8}{10}={r=2}{r},
    cell{4,6,8}{11}={r=2}{c},
    cell{4,6,8}{12}={r=2}{l},
    hline{1,2} = {1}{-}{},
    hline{1,2} = {2}{-}{},
    hline{3,4,6,8,10,12} = {}{-}{},
    colsep=5pt,
    column{4,7,10,13,16}={rightsep=1pt},
    column{5,8,11,14,17}={colsep=0pt},
    column{6,9,12,15,18}={leftsep=1pt},
    }

    Cases &  Left & Right && Below &&& Above &&& Numbers &&& Sum &&& Framework & \
    Case I & \ding{55}& \checkmark&& $0/\pi$&&& $0$ &&&$0$ && 0.1408&&0.1496 & 0.057&&0.059 \
    Case II  & \ding{55} & \checkmark&& $0/\pi$ && 0&&2\pi && $0$&& 0.1408&&0.1496 & 0.019&&0.054 \
    Case III & \checkmark & \ding{55} & 0&&0.78 & -2.362&&1.26 & 0.61&&1.20 & 0.0773&&0.1231 & 0.0059&&0.026 \ 
    & & & 3.14&&3.66 & & & & &&&&&&&&\ 
    Case IV & \checkmark & \ding{55} & 0&&0.78 & 0.60&&1.84 & 0.61&&1.20 & 0.0773&&0.1231 & 0.013&&0.025 \
    & & & 3.14&&3.66 & & & & &&&&&&&&\
    General Case & \checkmark & \ding{55} & -1.5&&0.6 & -3&&3 & -2.85&&1.13 & 0.06&&1.12 & 0.001&&0.03 \
    & & & 1.38&&1.57 & & & & &&&&&&&&\
    General Case & \ding{55} & \checkmark & -1.5&&0.6 & -3&&3 & -1.5&&0.01 & 0.115&&0.15 & 0.016&&0.06 \
    & & & 0.8 &&1.56 & &&& 1.33 && 1.7 &&&&&&\
\end{tblr}
\caption{Summary of the analysis.}\label{tab:summary}
\end{table}
\end{document}