Link list in data structure using c programming

Question, how would you write a program to meet the following requirements?

1. Read an unknown number of records from a file into memory. A typical record would look like:

    Ref  Title   Cost
    ---  -----   ----
    1234 Oracle_Guide 22.95
   

2. Perform a numeric sort based on the first field.
3. Delete duplicate records based on the first field.

read More ............................