#' trim_at
#'
#' @description Remove at caracter from users mentioned in tweet message
#'
#' @param x Character Message of tweet
#' @return Message of tweet without @@ simbol.
#' @author Istituto per la Bioeconomia Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#' @keywords retweet
#'
#'
#'
#' @export
trim_at <- function(x) {
sub('@', '', x)
}
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