Program: 62858
Project: 62858
Buggy source:
public String getCourseStudentListAsCsv(String courseId,String googleId) throws EntityDoesNotExistException {
  HashMap<String,CourseDetailsBundle> courses=getCourseSummariesForInstructor(googleId);
  CourseDetailsBundle course=courses.get(courseId);
  boolean hasSection=hasIndicatedSections(courseId);
  String export="String_Node_Str";
  export+="String_Node_Str" + "String_Node_Str" + Sanitizer.sanitizeForCsv(courseId) + Const.EOL+ "String_Node_Str"+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(course.course.name)+ Const.EOL+ Const.EOL+ Const.EOL;
  if (hasSection) {
    export+="String_Node_Str" + "String_Node_Str";
  }
  export+="String_Node_Str" + Const.EOL;
  for (  SectionDetailsBundle section : course.sections) {
    for (    TeamDetailsBundle team : section.teams) {
      for (      StudentAttributes student : team.students) {
        String studentStatus=null;
        if (student.googleId == null || student.googleId.equals("String_Node_Str")) {
          studentStatus=Const.STUDENT_COURSE_STATUS_YET_TO_JOIN;
        }
 else {
          studentStatus=Const.STUDENT_COURSE_STATUS_JOINED;
        }
        if (hasSection) {
          export+=Sanitizer.sanitizeForCsv(section.name) + "String_Node_Str";
        }
        export+=Sanitizer.sanitizeForCsv(StringHelper.recoverFromSanitizedText(team.name)) + "String_Node_Str" + Sanitizer.sanitizeForCsv(StringHelper.recoverFromSanitizedText(StringHelper.removeExtraSpace(student.name)))+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(StringHelper.recoverFromSanitizedText(StringHelper.removeExtraSpace(student.lastName)))+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(studentStatus)+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(student.email)+ Const.EOL;
      }
    }
  }
  return export;
}

Fixed version (ground truth):
public String getCourseStudentListAsCsv(String courseId,String googleId) throws EntityDoesNotExistException {
  HashMap<String,CourseDetailsBundle> courses=getCourseSummariesForInstructor(googleId);
  CourseDetailsBundle course=courses.get(courseId);
  boolean hasSection=hasIndicatedSections(courseId);
  String export="String_Node_Str";
  export+="String_Node_Str" + "String_Node_Str" + Sanitizer.sanitizeForCsv(courseId) + Const.EOL+ "String_Node_Str"+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(course.course.name)+ Const.EOL;
  if (hasSection) {
    export+="String_Node_Str" + "String_Node_Str";
  }
  export+="String_Node_Str" + Const.EOL;
  for (  SectionDetailsBundle section : course.sections) {
    for (    TeamDetailsBundle team : section.teams) {
      for (      StudentAttributes student : team.students) {
        String studentStatus=null;
        if (student.googleId == null || student.googleId.equals("String_Node_Str")) {
          studentStatus=Const.STUDENT_COURSE_STATUS_YET_TO_JOIN;
        }
 else {
          studentStatus=Const.STUDENT_COURSE_STATUS_JOINED;
        }
        if (hasSection) {
          export+=Sanitizer.sanitizeForCsv(section.name) + "String_Node_Str";
        }
        export+=Sanitizer.sanitizeForCsv(StringHelper.recoverFromSanitizedText(team.name)) + "String_Node_Str" + Sanitizer.sanitizeForCsv(StringHelper.recoverFromSanitizedText(StringHelper.removeExtraSpace(student.name)))+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(StringHelper.recoverFromSanitizedText(StringHelper.removeExtraSpace(student.lastName)))+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(studentStatus)+ "String_Node_Str"+ Sanitizer.sanitizeForCsv(student.email)+ Const.EOL;
      }
    }
  }
  return export;
}