Function del_char_tests

codegenr/src/helpers/string_ext.rs:220–227

todo: #[test_case("test", " t", "es")]

(v: &str, trimmer: &str, expected: &str)

  }

  fn pascal_case(&self) -> String {
    let (_, pascal) = self.trim().chars().fold((Some(true), String::with_capacity(self.len())), |acc, x| {
      let (upper_next, mut s) = acc;
      if is_out_of_case(x) {
        return (Some(true), s);
      }
      match upper_next {
        Some(true) => s.push(x.to_uppercase().next().unwrap_or(x)),
        _ => s.push(x),
      }
      (Some(false), s)