Changing from row to column with Shell script command

I hope
final.csv contains  below content

0   17.92204    -3.017933   35.14229
    20.89817    -2.37854    66.51003
1   18.27151    -3.179997   35.20044
    21.48396    -2.461451   66.48988
2   18.22776    -3.566021   34.87167
    21.78348    -2.575202   66.51389


Command used to get desired output

 cat final.csv | sed '/^$/d '|sed  -r “s/\s+/ /g" |sed "N;s/\n/ /g"
0   17.92204    -3.017933   35.14229     20.89817    -2.37854    66.51003
1   18.27151    -3.179997   35.20044     21.48396    -2.461451   66.48988
2   18.22776    -3.566021   34.87167     21.78348    -2.575202   66.51389