Data Conversion Using Sed or Awk - Name to Title - awk

Question

I have data in the below format:
APP_OWNER : hari
APP_AREA : Work:Business Area:AUS
APP_ID : 124080
APP_OWNER : ari
APP_AREA : Work:AUS
APP_ID : 124345
I want the data to be converted to below format.
APP_OWNER,APP_AREA,APP_ID
hari,Work:Business Area:AUS,124080
ari,Work:AUS,124345
I can convert one line but how to do it with 3 lines at the same time?
My Attempt with one line
sed '0,/: /s//\n/' test.txt
Original Question : Convert Rows to Columns Shell Script
Regards

Answer 1

Here is an awk solution without hardcoding any value:
awk -F '[[:blank:]]+:[[:blank:]]+' 'NR == 1 {fh=$1} !($1 in hdr) {tr = (tr == "" ? "" : tr ",") $1; hdr[$1]} $1 == fh && NR > 1 {print (body ? "" : tr ORS) td; body=1; td=""} {td = (td == "" ? "" : td ",") $2} END {print td}' file
APP_OWNER,APP_AREA,APP_ID
hari,Work:Business Area:AUS,124080
ari,Work:AUS,124345
Here is more readable version:
awk -F '[[:blank:]]+:[[:blank:]]+' '
NR == 1 {
fh = $1
}
!($1 in hdr) { # collect headers only once
tr = (tr == "" ? "" : tr ",") $1
hdr[$1]
}
$1 == fh && NR > 1 { # print header and body
print (body ? "" : tr ORS) td # if body=1 then print only body
body = 1
td = ""
}
{
td = (td == "" ? "" : td ",") $2
}
END {
print td
}' file

Answer 2

Could you please try following, written and tested with shown samples.
awk -F'[[:blank:]]+:[[:blank:]]+' -v OFS="," '
/^APP_OWNER/{
if(heading){
count=1
print heading
}
if(val){
print val
}
val=""
}
count=="" && !($1 in head){
head[$1]
heading=(heading?heading OFS:"")$1
}
{
val=(val?val OFS:"")$2
}
END{
if(val){
print val
}
}
' Input_file

Answer 3

$ cat tst.awk
BEGIN { OFS="," }
{
tag = val = $0
sub(/[[:space:]]*:.*/,"",tag)
sub(/[^:]+:[[:space:]]*/,"",val)
tag2val[tag] = val
}
!seen[tag]++ {
tags[++numTags] = tag
}
(NR%3) == 0 {
if ( !doneHdr++ ) {
for (tagNr=1; tagNr<=numTags; tagNr++) {
tag = tags[tagNr]
printf "%s%s", tag, (tagNr<numTags ? OFS : ORS)
}
}
for (tagNr=1; tagNr<=numTags; tagNr++) {
tag = tags[tagNr]
val = tag2val[tag]
printf "%s%s", val, (tagNr<numTags ? OFS : ORS)
}
delete tag2val
}
$ awk -f tst.awk file
APP_OWNER,APP_AREA,APP_ID
hari,Work:Business Area:AUS,124080
ari,Work:AUS,124345