Add quiz data cleaning
Add quiz data cleaning

nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming,nesterione/experiments-of-programming