Formats a given string so that `serde_json` crate can understand it.
# Example 1
``` rust
use serial_test::serial;
use json_string::prepare_json_string;
let original_str = r#"
[
{"tag":"lol", "groups":[]}
]
"#;
let prepared_str = prepare_json_string(original_str);
let expected_str = r#"[{"tag": "lol"}]"#;
assert_eq!(prepared_str, expected_str);
```
# Example 2
``` rust
use serial_test::serial;
use json_string::prepare_json_string;
let original_str = r#"
[
{"label":"lol", "customtags": {"k1": "v1"}}
]
"#;
let prepared_str = prepare_json_string(original_str);
let expected_str = r#"[{"label": "lol", "customtags": {"k1": "v1"}}]"#;
assert_eq!(prepared_str, expected_str);
```