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maxMod5  challenge

Last Modified: 2016-01-20

I am working on below challenge

I tried my code as below
public int maxMod5(int a, int b) {
  return a;
 if( (a==b)){
 return 0;
 else if( (b%5==a%5)){
 return 0;
 return 1;

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I am getting below result
Expected      Run            
maxMod5(2, 3) → 3      1      X         
maxMod5(6, 2) → 6      6      OK         
maxMod5(3, 2) → 3      3      OK         
maxMod5(8, 12) → 12      1      X         
maxMod5(7, 12) → 7      0      X         
maxMod5(11, 6) → 6      11      X         
maxMod5(2, 7) → 2      0      X         
maxMod5(7, 7) → 0      0      OK         
maxMod5(9, 1) → 9      9      OK         
maxMod5(9, 14) → 9      0      X         
maxMod5(1, 2) → 2      1      X         
other tests

how to  improve my approach, results and design of this challenge. How do i make a graphical venn or flow chart or some other relevant diagram to design it before writing code to decide best strategy?
 Please advise
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