Cast from String to char

Hello,
This is my code:

i'd like to like to add getenv("MYLIB") in the first case of my buffer inside of '1' , should i do the cast ? and how please ?

Thank you.

Remember, a string is just an array of characters.

char *str=getenv("MYLIB");
if(str!=NULL) 
{
        buffer[0]=str[0];
}
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