Refactor to remove prev cmd function and simplify escaping

src/suggestion.zsh

@@ -5,11 +5,11 @@
 
 # Delegate to the selected strategy to determine a suggestion
 _zsh_autosuggest_suggestion() {
-	local prefix="$1"
+	local escaped_prefix="$(_zsh_autosuggest_escape_command "$1")"
 	local strategy_function="_zsh_autosuggest_strategy_$ZSH_AUTOSUGGEST_STRATEGY"
 
 	if [ -n "$functions[$strategy_function]" ]; then
-		echo -E "$($strategy_function "$prefix")"
+		echo -E "$($strategy_function "$escaped_prefix")"
 	fi
 }
 
@@ -19,8 +19,3 @@ _zsh_autosuggest_escape_command() {
 	# Escape special chars in the string (requires EXTENDED_GLOB)
 	echo -E "${1//(#m)[\\()\[\]|*?]/\\$MATCH}"
 }
-
-# Get the previously executed command
-_zsh_autosuggest_prev_command() {
-	echo -E "${history[$((HISTCMD-1))]}"
-}