Tool for Reviewing Source Code

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I'm looking for a tool that can read and compare between two source code for instance.

private void Test()
{

int = 1;

}

is same as

private void Test()
{

    int = 1;

  }

But it is a different between

private void test()
{

int = 1;

}

and

private void Test()
{

    int = 1;

  }

Do you know a recommended software?

If possible, if would be greate to know a software in open source, freeware or commercial?

Thanks!