ListToString.java

public static String mapToString(List<String> list, String separator, String encapsulator) {
    StringBuilder stringBuilder = new StringBuilder();
    
    for (String item : list) {
        if (stringBuilder.length() > 0) stringBuilder.append(separator);
        stringBuilder.append(String.format("%1$s%2$s%1$s", encapsulator, item));
    }
    
    return stringBuilder.toString();
}