Normalize 'non_normalized.db'
#     Call the normalized database 'normalized.db'
#     Function Output: No outputs
#     Requirements:
#     Create four tables
#     Degrees table has one column:
#         [Degree] column is the primary key
    
#     Exams table has two columns:
#         [Exam] column is the primary key column
#         [Year] column stores the exam year
    
#     Students table has four columns:
#         [StudentID] primary key column 
#         [First_Name] stores first name
#         [Last_Name] stores last name
#         [Degree] foreign key to Degrees table
        
#     StudentExamScores table has four columns:
#         [PK] primary key column,
#         [StudentID] foreign key to Students table,
#         [Exam] foreign key to Exams table ,


give accurate code for the above requirements
#         [Score] exam score