gistfile1.txt

// Input: S = “2-5g-3-J”, K = 2
// Output: “2-5G-3J”

// Input: S = “5F3Z-2e-9-w”, K = 4
// Output: “5F3Z-2E9W”
function formater (chars, k) {
  console.log("chars", chars);
  console.log("k", k);

  chars = chars.replaceAll("-", "")
  chars = chars.toUpperCase();

  let output = "";

  const splited = chars.split("");
  const totalLen = splited.length;
  console.log("totalLen", totalLen);

  const pairs = totalLen / k;

  console.log("pairs", pairs);
  console.log("pairs", Number.isInteger(pairs));

  console.log("ceil", Math.ceil(pairs))
  console.log("floor", Math.floor(pairs))
  
  const isEven = Number.isInteger(pairs);
  let firstPart = false;
  
  let breakPoint = 0;
  
  const double = (Math.floor(pairs) - 1) * 2;
  console.log("double", double);
  
  const multipleLoops = (double > totalLen - 1);
  console.log("multipleLoops", multipleLoops)

  for(i = 0; i < totalLen; i++) {
    output += splited[i];
    console.log("pairs", pairs)
    
    if(pairs > 2) {
      if(isEven && !firstPart) {
        breakPoint = Math.floor(pairs) - 1;
      } else {
        breakPoint = Math.floor(pairs);
      }  
    } else {
      breakPoint = k - 1;
    }
    
    
    
    console.log("breakPoint");
    
    console.log(splited[i]);
    console.log("i", i);
    
    if(i == breakPoint) {
      output += "-";
      firstPart = true;
    } else {
      const division = i / breakPoint;
      if(multipleLoops && Number.isInteger(division) && i < totalLen -1) {
        
        console.log("i", i);
        console.log("totalLen", totalLen)
        console.log("splited", splited[i])
        
        output += "-";
      }
      
    }
    
    
  }
  console.log("chars", chars);

  return output;
}

const output = formater("5F3Z-2e-9-w", 4)

console.log("output", output)