Function format_swift_amount 

pub fn format_swift_amount(amount: f64, decimals: usize) -> String

Format amount for SWIFT output with comma decimal separator

This function ensures SWIFT-compliant amount formatting:

• Uses comma (,) as decimal separator instead of period (.)
• Maintains proper decimal precision as specified
• Keeps all decimal places including trailing zeros (per SWIFT spec)
• Ensures at least one digit in the integer part

Arguments

• amount - The amount to format
• decimals - Number of decimal places (typically 2 for most currencies)

Returns

SWIFT-formatted amount string with comma separator

Examples

use swift_mt_message::fields::swift_utils::format_swift_amount;

assert_eq!(format_swift_amount(1234.56, 2), "1234,56");
assert_eq!(format_swift_amount(1000.00, 2), "1000,00");
assert_eq!(format_swift_amount(1000.50, 2), "1000,50");