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#
#    mixString
#
#    Given two strings, A and B, create a bigger string made of the first char of A, the first
#    char of B, the second char of A, the second char of B, and so on.
#    Any leftover chars go at the end of the result.
#
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#
#   mixString("abc", "xyz") â†’ "axbycz"
#   mixString("Hi", "There") â†’ "HTihere"
#   mixString("xxxx", "There") â†’ "xTxhxexre"
#   mixString("xxx", "X") → "xXxx"
#   mixString("2/", "27 around") → "22/7 around"
#   mixString("", "Hello") → "Hello"
#   mixString("Abc", "") → "Abc"
#   mixString("", "") → ""
#   mixString("a", "b") → "ab"
#   mixString("ax", "b") → "abx"
#   mixString("a", "bx") → "abx"
#   mixString("So", "Long") → "SLoong"
#   mixString("Long", "So") → "LSoong"
#
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