code: public function get($pCoord)
      {
          if ($pCoord === $this->currentCoordinate) {
              return $this->currentCell;
          }
          $this->storeCurrentCell();
  
          // Return null if requested entry doesn't exist in collection
          if (!$this->has($pCoord)) {
              return null;
          }
  
          // Check if the entry that has been requested actually exists
          $cell = $this->cache->get($this->cachePrefix . $pCoord);
          if ($cell === null) {
              throw new PhpSpreadsheetException("Cell entry {$pCoord} no longer exists in cache. This probably means that the cache was cleared by someone else.");
          }
  
          // Set current entry to the requested entry
          $this->currentCoordinate = $pCoord;
          $this->currentCell = $cell;
          // Re-attach this as the cell's parent
          $this->currentCell->attach($this);
  
          // Return requested entry
          return $this->currentCell;
      }
docs: Get cell at a specific coordinate.
  
  @param string $pCoord Coordinate of the cell
  
  @throws PhpSpreadsheetException
  
  @return \PhpOffice\PhpSpreadsheet\Cell\Cell Cell that was found, or null if not found