Returns the string converted to the different styles specified

String Cases

//helper functions
const camel = function(input){
  //split the words
  let output = input.split(' ');
  //capitalize the words
  for (let i = 1; i < output.length; i++){
    output[i] = output[i][0].toUpperCase() + output[i].substring(1);
  }
  //join the words
  return output.join('');
}
const pascal = function(input){
  return input[0].toUpperCase() + camel(input).substring(1);
}
const snake = function(input){
  return input.replaceAll(' ', '_');
}
const kebab = function(input){
  return input.replaceAll(' ', '-');
}
const title = function(input){
  //split the words
  let output = input.split(' ');
  //capitalize the words
  for (let i = 0; i < output.length; i++){
    output[i] = output[i][0].toUpperCase() + output[i].substring(1);
  }
  //join the words
  return output.join(' ');
}
const vowel = function(input){
  let vowels = ['a','e','i','o','u'];
  //split the words
  let output = input.split('');
  //capitalize the vowels
  for (let i = 0; i < output.length; i++){
    if (vowels.includes(output[i])){
      output[i] = output[i].toUpperCase();
    }
  }
  //join the words
  return output.join('');
}
const consonant = function(input){
  let vowels = ['a','e','i','o','u'];
  //split the words
  let output = input.split('');
  //capitalize the consonants
  for (let i = 0; i < output.length; i++){
    if (!(vowels.includes(output[i]))){
      output[i] = output[i].toUpperCase();
    }
  }
  //join the words
  return output.join('');
}
const upper = function(input){
  return input.toUpperCase();  
}
const lower = function(input){
  return input.toLowerCase();
}

//main function
const makeCase = function(input, style) {
  /*casing styles:camel, pascal (camel & first letter cap),snake (_ for spaces), kebab (- for spaces), title (each word cap),
                  vowel (vowel cap), consonant (const cap),
                  upper (cap each letter), lower (uncap each letter)
  */
  if (!(Array.isArray(style))){
    style = [style];
  }
  let modifiedString = input;
  if (style.includes('camel')){
    modifiedString = camel(modifiedString);
  }if (style.includes('pascal')){
    modifiedString = pascal(modifiedString);
  }if (style.includes('snake')){
    modifiedString = snake(modifiedString);
  }if (style.includes('kebab')){
    modifiedString = kebab(modifiedString);
  }if (style.includes('title')){
    modifiedString = title(modifiedString);
  }if (style.includes('vowel')){
    modifiedString = vowel(modifiedString);
  }if (style.includes('consonant')){
    modifiedString = consonant(modifiedString);
  }if (style.includes('upper')){
    modifiedString = upper(modifiedString);
  }if (style.includes('lower')){
    modifiedString = lower(modifiedString);
  }
  return modifiedString;
}