restructure project

internal/builtins/str.go

@@ -0,0 +1,18 @@
+package builtins
+
+import (
+	"monkey/internal/object"
+	"monkey/internal/typing"
+)
+
+// Str ...
+func Str(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"str", args,
+		typing.ExactArgs(1),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	return &object.String{Value: args[0].String()}
+}