The goal of this challenge is to analyze a string to check if it contains two
of the same letter in a row. For example, the string "hello" has l twice
in a row, while the string "nono" does not have two identical letters in a
Define a function named double_letters that takes a single parameter. The
parameter is a string. Your function must return True if there are two
identical letters in a row in the string, and False otherwise.
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