Data Preprocessing – Fix Gender

Gender is having case issues when mapping to existing models.
```
'gender_Female': 0.0, 'gender_female': 0.06, 'gender_male': 0.02, 'gender_nan': 0.0,
```
**Easy solution:** *Consider a regex match for existing columns?*

**Best solution**: *Consider a regex algorithm for existing columns or columnar data?*