content size of a string

Good afternoon, please have a string type variable and it has a text of x characters, there is a function so that I can get the exact size of this content, I am joining 3 variables in a string and getting whitespace between them , example:
set variable to var1 & var2 & var3
So, what for?
text1                           text2                                      text3
and I need you to stay

text1 text2 text3

thank you