2232. Minimize Result by Adding Parentheses to Expression

You are given a 0-indexed string expression of the form "<num1>+<num2>" where <num1> and <num2> represent positive integers. Add a pair of parentheses to expression such that after the addition of parentheses, expression is a valid mathematical expression and evaluates to the smallest possible value. The left parenthesis must be added to the left of '+' and the right parenthesis must be added to