str_cat (STRING* string1, STRING* string2)
Appends a copy of string2 to the end of string1.
		Parameters:
		string1 - target string
		string2 - STRING* or	char*	to be added
        Returns:
        string1
  Modifies:
		
  string1 = string1 + string2
		Speed:
		
			Medium 
  
Remarks:
- Source and target strings must not be identical.
- 
              
              Either both or none of the strings 
              
must contain Unicode.
Example:
            STRING* s = "#30";
... 
str_cpy(s,"Hello "); // now s == "Hello "
str_cat(s,"World"); // now s == "Hello World"
See also:
		str_cpy, str_cmp,
		  
		  str_printf, str_clip, str_trunc,
    str_stri
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