C++ I have to write a function that will do the following things:

1. Trim out any punctuations from the beginning and the end of the string. For eg: ...4abc4... would become 4abc4.

2. If the string does not contain any alphabet, it will return an empty string. For eg: ^&^&98... would return an empty string.

string cleanToken(string s) {

// To do:

}

Thank You!