The string
[My bonnie is over the          ]
encodes into base64 as:
[TXkgYm9ubmllIGlzIG92ZXIgdGhlICAgICAgICAgIA==]

The string
[TXkgYm9ubmllIGlzIG92ZXIgdGhlICAgICAgICAgIA==]
decodes from base64 as:
[My bonnie is over the          ]