Return the first and last character of a string, concatenated together. If there is only one character in the string, the function should give that character back twice since it is both the first and last character of the string.
Example:
stringfirstandlast('boring example') = 'be'
that is it
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Omit columns averages from a matrix
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Getting the row and column location from a matrix
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Side of an equilateral triangle
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