chap 2.5.0

Chap is an easy to learn, interpretive, scripting language written in Rust
Documentation 
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use crate::builtin_function::utils::{param_to_datatype, param_to_datatype_mut, returns};
use crate::common::data_type::DataType;
use crate::common::errors::{ChapError, Result};
use crate::{common::executable::ExecutableLine, runtime::Runtime};

pub fn remove_at(runtime: &mut Runtime, executable: &ExecutableLine) -> Result<()> {
    let p2 = param_to_datatype(runtime, executable.params.get(1), executable.line_number)?.clone();
    let p1 = param_to_datatype_mut(
        &mut (*runtime),
        executable.params.first(),
        executable.line_number,
    )?;

    let result = if let (DataType::List(list), DataType::Int(index)) = (p1, p2) {
        if let Ok(index) = usize::try_from(index) {
            if index == 0 {
                return Err(ChapError::runtime_with_msg(
                    executable.line_number,
                    "list index starts from 1".to_string(),
                ));
            }
            list.remove(index - 1) // this is returning result
        } else {
            return Err(ChapError::runtime_with_msg(
                executable.line_number,
                format!("{} function negative index", executable.function_name),
            ));
        }
    } else {
        return Err(ChapError::runtime_with_msg(
            executable.line_number,
            format!(
                "correct form of {0} function: <list>, <index> -> {0} -> $var",
                executable.function_name
            ),
        ));
    };

    returns(runtime, executable, result)
}