Extract dynamic value from a string within parentheses

class Solution {
    public String dynamicName(String str) {
        // Create a StringBuilder to store the dynamic name
        StringBuilder sb = new StringBuilder();

        // Iterate through each character in the input string
        for (int i = 0; i < str.length(); i++) {
            // Check if the current character is an opening parenthesis '('
            if (str.charAt(i) == '(') {
                // If found, iterate through characters after the opening parenthesis
                for (int j = i + 1; j < str.length(); j++) {
                    // Check if the current character is not a closing parenthesis ')'
                    if (str.charAt(j) != ')') {
                        // Append the character to the StringBuilder
                        sb.append(str.charAt(j));
                    } else {
                        // If a closing parenthesis is found, exit the inner loop
                        break;
                    }
                }
            }
        }

        // Convert the StringBuilder to a String and return the dynamic name
        return sb.toString();
    }
}