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Convert string or const char* to char* in C++

const char* to char*

const char* foo = "this post is awesome!";
char* bar = (char*)malloc(sizeof(char) * MAX_NUM);
strcpy(bar, foo);

..............................................................

string to char*

string foo = "this post is awesome!";
const char* bar = foo.c_str();
// do const char* to char*
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