Help with the roman numerals converter

Hello everyone
so i tried two ways to solve this chalenge ,
one by using the ascii charecters themselves and one by writting english lettters as roman numerals,
but it seems that the test didn’t accept either way,any idea what’s wrong here?

   **Your code so far**

function convertToRoman(num) {
 let str = num.toString().split("").reverse();
 let str1 = [];
 let hundreds = ["C","CC","CCC","CD","D","DC","DCC","DCCC","CM","M"]
 //changing the first number to roman using a loop
for (let i = 1 ; i <= 10;i++){
if (parseInt(str[0]) === i){
 str1.push(String.fromCharCode(8543+i));
  }};
  //changing the second number by a mix of if and switch statment
  // i didn't like this one ,to many repetation
if(str[1]){
   switch (parseInt(str[1])){
     case 1:
     str1.push(String.fromCharCode(8553));
     break;
     case 2:
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     break;
     case 3:
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     break;
     case 4:
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8556));
     break;
     case 5:
     str1.push(String.fromCharCode(8556));
     break;
     case 6:
     str1.push(String.fromCharCode(8556));
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     break;
     case 7:
     str1.push(String.fromCharCode(8556));
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     break;
     case 8:
     str1.push(String.fromCharCode(8556));
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8553));
     break;
     case 9:
     str1.push(String.fromCharCode(8553));
     str1.push(String.fromCharCode(8556));
     break;
     }}
//changing the hundreds to roman numerals using english letters
 if(str[2]){
   for (let y = 1; y <= 10; y++ ){
     if(parseInt(str[2]) === y){
       str1.push(hundreds[y-1])
     }
   }
 }
str1 = str1.reverse().join("")

 console.log(str1)
return num;
}

convertToRoman(9);

Challenge: Roman Numeral Converter

Link to the challenge:

Answer is expected to be composed from normal letters - char codes from range 65 - 90. In the pasted code both approaches seems to be mixed a bit currently. If you’d still have troubles after reverting to the letters usage, feel free to post updated code.

thanks , that was helpful