Requirements:

For each Json field where key matches specified constant replace value with another constant.

```
{"regular":"a", "sensitive":"b"}

```

Parameters "sensitive", "\*\*\*\*\*".
Expected:

```
{"regular":"a", "sensitive":"*****"}

```

Values may, or may not have double quotes around them. Replacement constant is double quouted always. Json may be malformed. Java implementation preferably.

Key comparison is case insensitive.