Remove spaces, sample fuction usign bash shell

trim.sh

#!/bin/bash

# original string, with spaces
my_var=" Fuck  You! . ";
echo $my_var;

# the function
function trim() {
  local string=$@;
  string=${string//[[:space:]]};
  echo $string;
}

# passing one argument
my_var=$(trim $my_var);

# modified string, without spaces
echo $my_var;
exit