feat: change resource witout s

back-skeleton/initdb/1_TABLES.sql

back-skeleton/initdb/2_DEFAULT_ENTRIES.sql

...om/takima/backskeleton/controllers/StudentController.java

...src/main/java/com/takima/backskeleton/dao/StudentDao.java

.../src/main/java/com/takima/backskeleton/models/Course.java

...n/src/main/java/com/takima/backskeleton/models/Major.java

...src/main/java/com/takima/backskeleton/models/Student.java

.../java/com/takima/backskeleton/services/CourseService.java

...n/java/com/takima/backskeleton/services/MajorService.java

...java/com/takima/backskeleton/services/StudentService.java

back-skeleton/src/main/resources/application.properties