View Compilation Error

0_0_1623529_19207.cpp: In function `int main()':
0_0_1623529_19207.cpp:16: error: invalid conversion from `void*' to `char*'
0_0_1623529_19207.cpp: In function `char* mul(char*, char*)':
0_0_1623529_19207.cpp:79: error: invalid conversion from `void*' to `int*'
0_0_1623529_19207.cpp: In function `char* intArray2Str(int*, int)':
0_0_1623529_19207.cpp:118: error: invalid conversion from `void*' to `char*'
0_0_1623529_19207.cpp: In function `int* str2IntArray(char*)':
0_0_1623529_19207.cpp:130: error: invalid conversion from `void*' to `int*'