I´ve a json which is a list of dictionaries with the next syntax:

```
 [ 
     {
    "Date_and_Time": "Dec 29, 2017 15:35:37",
    "Componente": "Bar",
    "IP_Origen": "175.11.13.6",
    "IP_Destino": "81.18.119.864",
    "Country": "Brazil",
    "Age": "3"

},

{

    "Date_and_Time": "Dec 31, 2017 17:35:37",
    "Componente": "Foo",
    "IP_Origen": "176.11.13.6",
    "IP_Destino": "80.18.119.864",
    "Country": "France",
     'Id': '123456',
     'Car': 'Ferrari'

},
{
  "Date_and_Time": "Dec 31, 2017 17:35:37",
    "Age": "1",
    "Country": "France",
     'Id': '123456',
     'Car': 'Ferrari'
},
{
    "Date_and_Time": "Mar 31, 2018 14:35:37",
    "Componente": "Foo",
    "Country": "Germany",
     'Id': '2468',
     'Genre': 'Male'

}
]

```

The json is really big and each dictionary have different amount of key/values fields. And what I want to do is to rewrite each character of the KEYS into lower case. Expected input:

```
[ 
     {
    "date_and_time": "Dec 29, 2017 15:35:37",
    "componente": "Bar",
    "ip_origen": "175.11.13.6",
    "ip_destino": "81.18.119.864",
    "country": "Brazil",
     .
     .
     .

```