Preprocess the contaminant output file path to a relative path.

def _preprocessContaminantOutFilePath(outPath):
        """
        Preprocess the contaminant output file path to a relative path.
        """
        if '/' in outPath:
            splitPath = outPath.split('/')

        elif '\\' in outPath:
            splitPath = outPath.split('\\')

        else:
            splitPath = [outPath, ]

        if splitPath[-1] == '':
            outputFilename = splitPath[-2]

        else:
            outputFilename = splitPath[-1]

        if '.' in outputFilename:
            outputFilename = outputFilename.split('.')[0]

        return outputFilename