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Base 64 encoder/decoder

How it works:

1. Convert the text to its binary representation.
2. Divide the bits into groups of 6 bits each.
3. Convert each group to a decimal number from 0-63. It cannot be greater than 64 as there are only 6 bits in each group.
4. Convert this decimal number to the equivalent Base64 character using the Base64 alphabet.

See RFC-4648 for details.