String Trim

let str = ' f  hinewf  ijnfe  oifrh ello       ';

const trim = (string) => {
  let start = 0;
  let end = 0
  let result = ''
  for( let i = 0; i <= string.length-1;i++){
    if( string[i] !== ' '){
      start = i;
      break;
    }
  }
  for(let j= string.length-1;j >= 0;j--){
    if(string[j] !== ' '){
      end = j+1;
      break;
    }
  }
  result = string.substring(start, end)
  return result
};

console.log(trim(str));