function toCamelCase(str) {
  let camelCaseString = "";

  if (str) {
    const words = str.split(/[-_]/);
    let res = "";

    for (let i = 1; i < words.length; i++) {
      const firstLetter = words[i][0].toUpperCase();
      const rest = words[i].slice(1).toLowerCase();
      res += firstLetter + rest;
    }

    camelCaseString = words[0] + res;
  }

  return camelCaseString;
}

function toCamelCase(str) {
  let camelCaseString = "";

  if (str) {
    const words = str.split(/[-_]/);
    let res = "";

    for (let i = 1; i < words.length; i++) {
      const firstLetter = words[i][0].toUpperCase();
      const rest = words[i].slice(1).toLowerCase();
      res += firstLetter + rest;
    }

    camelCaseString = words[0] + res;
  }

  return camelCaseString;
}

function toCamelCase(str) {
  let camelCaseString = "";

  if (!str) {
    const words = str.split(/[-_]/);
    let res = "";

  for (let i = 1; i < words.length; i++) {
    const firstLetter = words[i][0].toUpperCase();
    const rest = words[i].slice(1).toLowerCase();
    res += firstLetter + rest;
  }

    }
}

function toCamelCase(str) {
  let camelCaseString = "";

  if (!str) {
    const words = str.split(/[-_]/);
    let res = "";

  for (let i = 1; i < words.length; i++) {
    const firstLetter = words[i][0].toUpperCase();
    const rest = words[i].slice(1).toLowerCase();
    res += firstLetter + rest;
  }

    }
}