a custom facts script that returns a long cluttered string instead of valid json

mdl_info.fact

#!/bin/bash
#{{ ansible_managed }}
### extracting information from moodle instances

cd /home/vhosts/moodle

function getinstances() {
	MDL_INSTANCES=`find * -maxdepth 0 -not -name "_*" |xargs echo`
}

getinstanceinfo() {
	INSTANCE_ARRAY=()
	for i in $MDL_INSTANCES
	do
		source /home/vhosts/moodle/$i/_update.conf
		firstname="$(mysql -u $UM_DBUSER -p$UM_DBPASS -h mysql -e 'SELECT firstname FROM mdl_user WHERE id=2;' $UM_DBNAME)"
		firstname=${firstname#firstname}
		lastname="$(mysql -u $UM_DBUSER -p$UM_DBPASS -h mysql -e 'SELECT lastname FROM mdl_user WHERE id=2;' $UM_DBNAME)"
		lastname=${lastname#lastname}
		email="$(mysql -u $UM_DBUSER -p$UM_DBPASS -h mysql -e 'SELECT email FROM mdl_user WHERE id=2;' $UM_DBNAME)"
		email=${email#email}
		supportemail="$(mysql -u $UM_DBUSER -p$UM_DBPASS -h mysql -e "SELECT value FROM mdl_config WHERE name='supportemail';" $UM_DBNAME)"
		supportemail=${supportemail#value}
		string="\"domain\":\"$i\",\"firstname\":\"$firstname\",\"lastname\":\"$lastname\",\"email\":\"$email\",\"supportemail\":\"$supportemail\""
		string=$(echo $string | tr -d '\n')
		INSTANCE_ARRAY+=("$string")
	done
}

# creating json for ansible extraction
writetostdout() {
        printf '['
        for (( i=0; i<${#INSTANCE_ARRAY[@]}-1; i++ )) 
        do
               	printf "{${INSTANCE_ARRAY[$i]}}," 
        done
        printf "{${INSTANCE_ARRAY[-1]}}" 
        printf ']'
}

getinstances
getinstanceinfo
writetostdout