Improved Formatted Reading

[brightprogrammer]

Formatted reading now better detects the length of content to be parsed. Before attempting to read value at a placeholder, it'll first find the maximum possible length of reading that. This works by the following logic :

• If there are two placeholders, and nothing is between them, the first placeholder can read as much as possible, and second placeholder may get empty!
• If there are two placeholders, and there's something in between them, first placeholder can only read up until the content between the space between the placeholders. So for {} {}, first placeholder can only read up until first space. Then rest becomes possible read length of second placeholder.
• If there is only one placeholder, it'll get to read the whole string. It may or may not read it completely.

This new logic makes fmt reading much more helpful and easy to work with. This means more string format checking when parsing input. Pair this with the new format specifier {s} in last PR #22, it makes it easier to parse strings, and formatted strings!