[JavaScript][NodeJS] backup original file to '.bak', reads file-content (smali), some string manipulation (nullify void-method's content, preserving '.locals...' line), writes back overwriting the file's-content. Will skip abstract method or if for some reason it can't find '.locals' (or other reasons that makes the method-textual-content invalid). Useful tool in nullifying lib.s preserving method name and argument ("signature") but emptying it up.