Cleaning variables

Users of an online entry system used to have the ability to freely type in responses to questions. This is causing issues when trying to analyze the adoptable dogs dataset, dogs. Here is the current frequency table of the "sex" column:

male      1672
female    1249
 MALE        10
 FEMALE       5
Malez        1

Now that the system only takes responses of "female" and "male", you want this variable to match the updated system.