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function removeDuplicateChar(str){
if(!str)return ''
str = str.toString()
for(let i=0;i < str.length;i++){
let charStr = str[i]
let okStr = str.substring(0,i+1)
let surplus = str.substring(i+1,str.length)
surplus = surplus.replace(new RegExp(charStr, "gm"), '');
str = okStr + surplus
}
return str
}
const strOne = "aaaaaaaaabbbababababababbacdjkabacdjkabacdjkabacdjkaaaergds"
console.log(strOne)
console.log(removeDuplicateChar(strOne))