code: private int[][] initializeHydrogenPairCheck(int[][] pairCheck) {
          for (int i = 0; i < pairCheck.length; i++) {
              for (int j = 0; j < pairCheck[0].length; j++) {
                  pairCheck[i][j] = 0;
              }
          }
          return pairCheck;
      }
docs: Method initialise the HydrogenpairCheck with a value
  
  @param pairCheck value
  @return void