TESDOME - Test for Jr Developer - Epic Fall!

I have just done a little test that it'd be presented to a junior developer. It wasn't difficult at all, but time ran out before I corrected my mistake! So easy to become slow in what you don't use daily!

THE TEST:

Find the index of the longest run in a give string. For example, in the string
 str ="abbcccddddcccbbaa" the value to return would be 6, which is the index of the first "d" (the char repeated 4 times in a run).

A SIMPLE SOLUTION:

char[] c = str.ToCharArray();
int count =1;
int longestRun=0;
int longestPosition=0;
int position=0;

for (int i=0; i< c.Length-2; i++)
{
    position =i;
    if (c[i] == c[i+1]) count++;
    else
      {
         if (longestRun < count)
         {
              longestRun = count;
              longestPosition = position - count +1;       
          }
          else count =1;
      }
}
Console.WriteLine(longestPosition);



Given the IDE of TestDome which doesn't allow you for much testing or displaying values to check how you are doing, neither the time give is enough to investigate what the IDE can do for you, this is the best line of though I could improvise. Needless said that I didn't have time to copy the code to visual studio, debug and paste the working code back on time! :O I might be too slow...

PR

I would love to see a good solution!!!!