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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I would look to existing libraries to see how they solve the problem. Stack Overflow is OK, but I find that the "one liner" solutions you find there often oversimplify. There is a popular, and currently maintained, Rubygem library called Mail that includes a class for quoted printable, which in turn provides a class method for decoding quoted printable strings.
NOTE:
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Hence, a higher number means a more popular project.