View Compilation Error

0_0_22963609_13453.cpp: In function 'void merge(Point*, Point*, int, int, int)':
0_0_22963609_13453.cpp:105:61: error: ambiguating new declaration of 'void merge(Point*, Point*, int, int, int)'
 void merge(Point y[], Point z[], int begin, int mid, int end)
                                                             ^
0_0_22963609_13453.cpp:24:5: note: old declaration 'int merge(Point*, Point*, int, int, int)'
 int merge(Point *,Point *,int ,int ,int);
     ^
0_0_22963609_13453.cpp:120:9: error: return-statement with a value, in function returning 'void' [-fpermissive]
  return 0;
         ^