Function convbase_underscore 

pub fn convbase_underscore(val: i64, base: u32, underscore: i32) -> String

Convert integer to string with underscores for readability Port of convbase_underscore(char *s, zlong v, int base, int underscore) from Src/params.c:5646. WARNING: param names don’t match C — Rust=(val, base, underscore) vs C=(s, v, base, underscore)