# [Python 2], 58 bytes

<!-- language-all: lang-python -->

 lambda*m:''.join(map(lambda*r:''.join(filter(None,r)),*m))

[Try it online!]

[Python 2]: https://docs.python.org/2/
[Try it online!]: https://tio.run/nexus/python2#S7ON@Z@TmJuUkqiVa6WurpeVn5mnkZtYoAEVLIILpmXmlKQWafjl56XqFGlq6mjlamr@LyjKzCtRSNPIzCsoLdHQ1EGjNf@rOzo5u7iqc6knKiQDSUMjYwVTM3N1AA "Python 2 – TIO Nexus"