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/// Format a number with commas as thousands separators
pub fn format_count(count: usize) -> String {
let mut s = count.to_string();
let l = s.len();
for i in 1..l {
if i % 3 == 0 {
s.insert(l-i, ',');
}
}
s
}
#[test]
fn test_format_count() {
assert_eq!(&format_count(1), "1");
assert_eq!(&format_count(12), "12");
assert_eq!(&format_count(123), "123");
assert_eq!(&format_count(1234), "1,234");
assert_eq!(&format_count(12345), "12,345");
assert_eq!(&format_count(123456), "123,456");
assert_eq!(&format_count(1234567), "1,234,567");
assert_eq!(&format_count(12345678), "12,345,678");
assert_eq!(&format_count(1234567890), "1,234,567,890");
}
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