how to split string into 2 with a space in c code example

Example: split string at space C

char* string;
char* first;
char* second;

for (int i=0;i<=strlen(string);i++) {
	if (string[i] == ' ') {
		string[i] = '\0';
		first = string;
		second = string+i+1;
		break;
	}
}