#' A letter counting function
#'
#' This function counts letters
#' @param which string would you like to count the letters of
#' @keywords string count
#' @export
#' @examples
#' dfbind()
dfbind = function(df_origin, df_new){
if(is.null(df_new)){ return(df_origin)}
if(nrow(df_origin)==0 ) {
return(df_new)
}
else{
return(rbind(df_origin,df_new))
}
}
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