I have a really big data frame and it contains a specific column "city" with multiple cities repeating but in different case, for eg -

```
***City***

Gurgaon
GURGAON
gurgaon
Chennai
CHENNAI
Banglore
Hydrabad
BANGLORE
HYDRABAD

```

.

Is there a way to replace all the same cities with different case, with a single name.

There are total 3k rows in each column, so manually it's not possible.

Edit -

The city column of the DF also contains cities like

```
'Gurgaon'

'GURGAON'

'gurgaon '          #there is a white space at the end

```

I want something so that they all change to the same name and the delimiter is also removed. So that the output is →

```
 'Gurgaon'
 'Gurgaon'
 'Gurgaon'        #no white space at the end

```

Thanks