The diamond kata takes as its input a letter, and outputs it in a diamond shape. Given a letter, it prints a diamond starting with 'A', with the supplied letter at the widest point.
In the following examples, spaces are indicated by
Diamond for letter 'A':
Diamond for letter 'C':
··A·· ·B·B· C···C ·B·B· ··A··
Diamond for letter 'E':
····A···· ···B·B··· ··C···C·· ·D·····D· E·······E ·D·····D· ··C···C·· ···B·B··· ····A····
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