Safe Call

Create a function called safeCall that accepts another function f as a parameter, calls f without any arguments and returns true if f has executed without any errors or false if f has thrown an error. Sample usage:
```
safeCall(() => console.log('Hello!')); // true
safeCall(() => JSON.parse('abc')); // false
safeCall(() => false); // true
safeCall(() => abc); // false
```
(optional) Make safeCall callable on any function: f.safeCall(...). It should take the same parameters and has the same effect as f.call(...), except in case when f throws an error, it should instead just return null without throwing any errors.

Yevhen-Kryvdiuk/js_safe-call