TeacherAssistant challenge has no error code, and does not pass.

public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {
    // These things should be verified:
    // 1.  Member fields must start with an 'm'
    if (fieldName.charAt(0) != 'm') {
     throw  new IllegalArgumentException(fieldName + "does not start with an m");
    }
    // 2.  The second letter in the field name must be uppercased to ensure camel-casing
    char secondLetter = fieldName.charAt(1);
    if (! secondLetter.isUpperCase()) {
     throw new IllegalArgumentException(fieldName + "is not camel case"); 
    }
    // NOTE:  To check if something is not equal use the != symbol. eg: 3 != 4
    return fieldName;
  }

}