code: def merge(s, t):
      
  
      for k, v in t.items():
          if isinstance(v, dict):
              if k not in s:
                  s[k] = v
                  continue
  
              s[k] = merge(s[k], v)
              continue
  
          s[k] = v
  
      return s
docs: Merge dictionary t into s.