I'm trying to pad all the items of an array to 20 characters with whitespace, but can't seem to get my loop to work properly. It appears to increment through the array items correctly, but does not alter the items. Where am I going wrong here?

```
#!/bin/bash

testArray=( "bish" "bash" "bosh")

padLine () {
array=( "${@}" )
testLength=20
counter=0

##loop begins here##
for i in "${array[@]}";
do
size=${#array[$counter]}
testLength=20

#echo ""
#echo "size: " $size
#echo "Tlength: " $testLength
#echo "count: " ${array[$counter]}
#echo ""

if [ $size -lt $testLength ]
then 
    offset=$( expr $testLength - $size )

    #echo "Offset: " $offset

    case $offset in
        0)
            l0=""
            ;;
        1)
            l1=" "
            array[$counter]=${array[$counter]/%/$l1};;
        2)
            l2="  "
            array[$counter]="${array[$counter]/%/$l2}";;
        3)
            l3="   "
            array[$counter]=${array[$counter]/%/$l3};;
        4)
            l4="    "
            array[$counter]="${array[$counter]/%/$l4}";;
        5)
            l5="     "
            array[$counter]="${array[$counter]/%/$l5}";;
        6)
            l6="      "
            array[$counter]=${array[$counter]/%/$l6};;
        7)
            l7="       "
            array[$counter]=${array[$counter]/%/$l7};;
        8)
            l8="        "
            array[$counter]=${array[$counter]/%/$l8};;
        9)
            l9="         "
            array[$counter]=${array[$counter]/%/$l9};;
        10)
            l10="          "
            array[$counter]=${array[$counter]/%/$l10};;
        11)
            l11="           "
            array[$counter]=${array[$counter]/%/$l11};;
        12)
            l12="            "
            array[$counter]=${array[$counter]/%/$l12};;
        13)
            l13="             "
            array[$counter]=${array[$counter]/%/$l13};;
        14)
            l14="              "
            array[$counter]=${array[$counter]/%/$l14};;
        15)
            l15="               "
            array[$counter]=${array[$counter]/%/$l15};;
        16)
            l16="                "
            array[$counter]=${array[$counter]/%/$l16};;
        17)
            l17="                 "
            array[$counter]=${array[$counter]/%/$l17};;
        18)
            l18="                  "
            array[$counter]=${array[$counter]/%/$l18};;
        19)
            l19="                   "
            array[$counter]=${array[$counter]/%/$l19};;

        *)
    esac
fi
counter=$( expr $counter + 1 )  
done
}

padLine "${testArray[@]}"

echo -e "${testArray[0]}" 
echo -e "${testArray[1]}"
echo -e "${testArray[2]}"

```

Expected output: 

```
bish                #lines end here, padded to 20 chars
bash                #                
bosh                #

```

Actual output: 

```
bish# no padding
bash
bosh

```