Function format_usd 

pub fn format_usd(amount: f64) -> String

Formats a USD amount with adaptive precision.

Arguments

• amount - Amount in dollars

Returns

Formatted string with $ prefix

Examples

use rtk::utils::format_usd;
assert_eq!(format_usd(1234.567), "$1234.57");
assert_eq!(format_usd(12.345), "$12.35");
assert_eq!(format_usd(0.123), "$0.12");
assert_eq!(format_usd(0.0096), "$0.0096");