Apache-Spark-and-Databricks-Stream-Processing-in-Lakehouse
                                
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                        just a minor bug in 02-word-count-test-suite.py
typo is causing problem as checkpoint directory won't get deleted.
dbutils.fs.rm(f"{self.base_data_dir}/chekpoint", True)
dbutils.fs.rm(f"{self.base_data_dir}/checkpoint", True)