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At some point in developer’s carrier, there might be times when they have to deal with legacy codes—a program written by unknown person. Working with these legacy codes can be challenging, due its enigmatic structure and unfamiliar language used by unknown programmers. As this legacy software application carries enormous amount of latent defects, developers have to spend most of their time fixing bugs and struggling with fragile code rather than building new features. With all these challenges around, one question that remains in every developers mind is “how to overcome these challenges associated with legacy codes?”