code: public Cell getCellByName(String table, String cellName) {
  
          for (Cell c : getCellsByTable(table)) {
              if (c.getCellName().equals(cellName)) {
                  return c;
              }
          }
          return null;
      }
docs: Returns the Cell (associated to <i>table</i>) whose name is cellName, or null if this Cells object contains no
  cell whose name is cellName.
  
  @param cellName the name of the Cell we want to retrieve from this Cells object.
  @return the Cell whose name is cellName contained in this Cells object. null if no cell named cellName is
  present.