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Complete the function joinStrings() so that it returns a string with all the strings in words concatenated. You should use sep as a...
X663: Join all strings with separator
Complete the function joinStrings() so that it returns a string with all the strings in words concatenated. You should use sep as a separator between words. You may assume that the array words has some elements (it is not empty).
Examples:
joinStringsWSep({"Go","Niners"},"!") -> "Go!Niners"
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