fix string comparison against system, to work on all platforms

emulator=""

system=`uname -s`

if [[ ($system == "Linux") && (`uname -a` == "*@(microsoft|Microsoft|wsl|WSL)*") ]]; then

if [[ ($system == "Linux") && (`uname -a` =~ (microsoft|Microsoft|wsl|WSL) ) ]]; then

    system="WSL"

fi

if [[ ($system == "Linux") || ($system == "Darwin") ]]; then

    emulator="wine"

fi

coan_exists () {

  type coan &> /dev/null ;

}