Characters in range

function solve (charOne, charTwo){
    let firstCode = charOne.charCodeAt(0);
    let lastCode=charTwo.charCodeAt(0);
    let start=Math.min(firstCode, lastCode);
    let end=Math.max(firstCode, lastCode);
    let characters=[];
    for (let i = start+1; i < end; i++) {
       let currentCharacter=String.fromCharCode(i);
       characters.push(currentCharacter);
}
console.log(characters.join(' '));
}