fix: Correct symbol for billion from 'g' to 'b' Update index.ts

[famouswizard]

The symbol 'g' was being used to represent a billion (1e9). According to standard notation:

• 'k' stands for thousand (10³),
• 'm' for million (10⁶),
• 'b' for billion (10⁹),
• 't' for trillion (10¹²),
  and so on.

This change replaces 'g' with 'b' to correctly represent a billion. Let me know if there are any concerns!

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[lochie]

great improvement @famouswizard, thank you!