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, returns};
use crate::common::data_type::DataType;
use crate::common::errors::{ChapError, Result};
use crate::{common::executable::ExecutableLine, runtime::Runtime};

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

    let sum = add_data_types(p1, p2)?;

    returns(runtime, executable, sum)
}

pub fn add_data_types(dt1: &DataType, dt2: &DataType) -> Result<DataType> {
    match (dt1, dt2) {
        (DataType::Int(x1), DataType::Int(x2)) => Ok(DataType::Int(x1 + x2)),
        (DataType::Int(x1), DataType::Float(x2)) => Ok(DataType::Float(f64::from(*x1) + x2)),
        (DataType::Float(x1), DataType::Int(x2)) => Ok(DataType::Float(x1 + f64::from(*x2))),
        (DataType::Float(x1), DataType::Float(x2)) => Ok(DataType::Float(x1 + x2)),
        _ => Err(ChapError::runtime_with_msg(
            0,
            "add function works only with numbers int and float".to_string(),
        )),
    }
}