I want to remove double quotes from a json string if the type of value is number.

sample Input String

```
 "font": {
                            "style": "normal",
                            "weight": "normal",
                            "decoration": "none",
                            "size": "15",
                            "color": "#000000"
                          }

```

Expected Output string 

```
 "font": {
                            "style": "normal",
                            "weight": "normal",
                            "decoration": "none",
                            "size": 15,
                            "color": "#000000"
                          }

```

how it can done??