Code clones are similar program structures of considerable size and significant similarity. Several studies suggest that as much as 20-50 percent of large software systems consist of cloned code. Knowing the location of clones helps in program understanding and maintenance. Some clones can be removed with refactoring, by replacing them with function calls or macros, or we can use unconventional meta level techniques such as Aspect-Oriented Programming or XVCL to avoid the harmful effects of clones.