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How about this:

addspace () {
LEN=${#1}
for ((c=0;c<$LEN;c++))
do
echo -n "${1:$c:1} "
done
echo ${1:$LEN:1}
}
addspace "abcdef"

And if your shell dosn't...

# cat script
#!/bin/bash
if [ $# -ne 1 ] ;then
echo Usage: $0 [string];exit
fi
for ((s=0;s<${#1};s++))
do
case $final in
^.) final=${1:$s:1};;
...