Fix typo causing files to not be found

compile.sh

@@ -6,12 +6,8 @@ files="$1"
 compiler="$2"
 options="$3"
 
-echo "Workspace: $GITHUB_WORKSPACE"
-cd "$GITHUB_WORKSPACE"
-ls -lh ./
-
 for f in $files; do
-  if [-f "$f" ]; then
+  if [ -f "$f" ]; then
       echo "Compiling '$f'.."
       $compiler $options $f
   else