concatenation of the values of the fields to update a column

Hello.

I have several columns in my table. I want to concatenate the value of a column to another.

for example

I want to PASS B value = value of COL B and c PASS.

Is this possible? I know that
UPDATE tbl SET COL B =  COL C + COL B  
does not, as the Oracle sees it as a mathematical equation.
UPDATE tbl SET COL B =  COL C   
work, manufacturing COL B is equal to, or rather as value of the COLLAR C.

Let's say COL b John and COL C a Smith, and I wanted to PASS B show JohnSmith, for example.

What is the right syntax? I can't be that far off. Comments or a tip is appreciated!

Thank you.
UPDATE tbl SET COLB =  COLB||COLC
OR
UPDATE tbl SET COLB =  CONCAT(COLB,COLC)

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