View Compilation Error

0_0_35201814_14423.cpp: In function 'int main()':
0_0_35201814_14423.cpp:42:7: error: redeclaration of 'int k'
   int k = strlen(s) - 1;
       ^
0_0_35201814_14423.cpp:32:7: note: 'int k' previously declared here
   int k  = 0;
       ^