Code review/v2

[giladHaimov]

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[giladHaimov]

@jackcrypto9527 @falcon2048 the only benefit I see in issuing a low-level call is removing the need for an explicit interface, I am not sure this interface justifies the bother.
Now as long as we do not implement fallback() there's no security concern. if the parameter signature ever changes in the destination file the operation will revert either way.
But as a general rule though I try to avoid low-level calls whenever possible. it's just harder to read and maintain. Using high-level calls also protects you from spelling errors which are possible in the low-level approach.

Also note that there's no need for adding new files, you can interleave an interface definition within the calling contract e.g.:

interface ISTCore is IERC20 {
function mint(address, uint256) external;
function burn(address,uint256) external;
}