intoCamelCase

const convertCamel = function (varNames) {
  const initial = varNames.trim().toLowerCase();
  const converted = initial.slice(initial.indexOf('_')).replace('_', '');
  const capitalize = converted.replace(
    converted[0],
    converted[0].toUpperCase()
  );

  const camaled = initial.slice(0, initial.indexOf('_')) + capitalize;
  const ticks = '✅'.repeat(converted.length); // Add green ticks based on the length of the converted variable name
  return `${camaled}${ticks}`;
};

console.log(convertCamel('underscore_case'));
console.log(convertCamel('first_name'));
console.log(convertCamel('Some_Variable'));
console.log(convertCamel(' calculate_AGE'));
console.log(convertCamel('delayed_departure'));