x is assumed to be a vector of characters which stand for
filenames. The extension of the file name is the suffix that
occurs after the last dot (.) in every component of x. The
substitution is done in two steps. First the existing extension
of x is removed using function
sans_ext. Then the new
extension is added with a dot (.) as separator.
vector with original file names
new extension to be added
file names with new extensions
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