如果一个字符重复多次，则删除该单词

function removeDuplicateWords(str) {
  let words = str.split(' '); // 将字符串分割成单词
  let result = '';

  for (let i = 0; i < words.length; i++) {
    let word = words[i];
    let duplicateChar = findDuplicateChar(word); // 找到重复出现的字符

    if (duplicateChar) {
      let regex = new RegExp(duplicateChar, 'g');
      word = word.replace(regex, ''); // 将重复出现的字符替换为空字符串
    }

    if (word !== '') {
      result += word + ' ';
    }
  }

  return result.trim(); // 去除首尾空格
}

function findDuplicateChar(word) {
  let charMap = {};

  for (let i = 0; i < word.length; i++) {
    let char = word[i];

    if (charMap[char]) {
      return char; // 返回重复出现的字符
    } else {
      charMap[char] = true;
    }
  }

  return null; // 没有重复出现的字符
}

let input = 'helloo worldd'; // 输入字符串
let output = removeDuplicateWords(input); // 调用函数进行处理

console.log(output); // 输出结果：helo world