pub fn to_pascal_case(s: &str) -> String {
s.split('_')
.map(|word| {
let mut c = word.chars();
match c.next() {
None => String::new(),
Some(f) => f.to_uppercase().collect::<String>() + c.as_str(),
}
})
.collect()
}
pub fn to_snake_case(s: &str) -> String {
let mut result = String::new();
for (i, ch) in s.chars().enumerate() {
if ch.is_uppercase() && i > 0 {
result.push('_');
}
result.push(ch.to_lowercase().next().unwrap());
}
result
}