i have csv as below
col1,col2,col3,col4,col5
1,val1,57,val1,TRUE
,val2,,val2,
,val3,,val3,
,val4,,val4,
,val5,,val5,
2,val1,878,val1,FALSE
,val2,,val2,
,val3,,val3,
,val4,,val4,
,val5,,val5,
i need to display the output using awk as below
col1,col2,col3,col4,col5
1,val1#val2#val3#val4#val5,57,val1#val2#val3#val4#val5,TRUE
2,val1#val2#val3#val4#val5,878,val1#val2#val3#val4#val5,FALSE