Method insert_separator

crates/common/src/format.rs:406–412

(mut magnitude_str: String, inter: i32, sep: char, sep_cnt: i32)

    }

    fn insert_separator(mut magnitude_str: String, inter: i32, sep: char, sep_cnt: i32) -> String {
        let magnitude_len = magnitude_str.len() as i32;
        for i in 1..=sep_cnt {
            magnitude_str.insert((magnitude_len - inter * i) as usize, sep);
        }
        magnitude_str
    }

    fn validate_format(&self, default_format_type: FormatType) -> Result<(), FormatSpecError> {
        let format_type = self.format_type.as_ref().unwrap_or(&default_format_type);