trim: removing the cell space at both ends.
concat / &: connecting the cell contents.
mid: intermediate string string extraction.
left: String string to the left of the extract.
right: the right string string extraction.
replace / substitute: replace several consecutive character string or a character.
len / lenb: calculating the string length. NOTE: For len, one length is calculated as a Chinese character, for lenb, one length is calculated as 2 Chinese characters, English characters, or numbers for no difference.
