fix(cmd): handle errors and improve output formatting

* update error handling in various commands to use blank identifier
* enhance output formatting for better readability
* add golangci-lint to Makefile for linting checks

pkg/parser/parser.go

@@ -88,7 +88,7 @@ func parseCreateFunction(stmt []cst.Tok) (*cst.CreateFunction, bool) {
 	if i+1 < len(stmt) && stmt[i].Is("or") && stmt[i+1].Is("replace") {
 		i += 2
 	}
-	if i >= len(stmt) || !(stmt[i].Is("function") || stmt[i].Is("procedure")) {
+	if i >= len(stmt) || (!stmt[i].Is("function") && !stmt[i].Is("procedure")) {
 		return nil, false
 	}
 	i++