Reverse word with char in place

function reverseSenWithSpecialChar(str){
    let specialSet= new Set([";","\'","\:","\"","\\","\|","\.","\<","\>","\?","\!","\,"]);
    let revString = new Array(str.length).fill(null);
    
    for(let x=0; x<str.length; x++){
        if(specialSet.has(str[x])){
            revString[x]=str[x]
        }
    }
    let word='',reverseSen=''
    for(let x=str.length-1; x>-1; x--){
     //   console.log(str[x])
        if(str[x]===" "){
            reverseSen=word+" "+reverseSen;
            word=''
        }
        
        else{
            if(!specialSet.has(str[x]))
            word+=str[x];
        }
        
    }
    
    reverseSen= word+" "+reverseSen;
    let i=0,j=0;
    while(i<revString.length){
        if(!revString[i]){
            revString[i]=reverseSen[j];
            j++;
        }
        i++;
    }
    
    return revString.join('');
}


console.log(reverseSenWithSpecialChar("I'm a cat, yo'u?"));