l have the following dataset and would like to calculate the actual survival time by 
  if censoring time > survival time then actual survival time =survival time else its= censoring time.
        treatmentgrp strata  censoringTime    survivalTime     censoring   actualsurvivaltim
     [1,]             1      1       1.012159           1137.80922                0
   [2,]             2      2      32.971439           247.21786                 0
   [3,]             2      1      85.758253           797.04949                 0
   [4,]             1      1      16.999171            78.92309                  0
  
  l used matrix to genarate the data
  thanks in advance
  
  
       
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