write a function glue-strings that consumes a list of strings los and produces a single string obtained by using string-append to attach them all together. For example, (glue-strings (cons "ab" (cons " " (cons "bcd" empty)))) ⇒ "ab bcd" . A modified list template is provided as a starting point. Remember to complete the function by relying on the template—don’t guess at the structure of the recursive case!
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