I cannot figure out why this code doesn't work. It should replace every 's' character with a 'f' character. It manages to replace once then terminates the string directly after.

Example: "This is a test string!" becomes "Thif", when it should be "Thif if a teft ftring!".

Code:

---

char* chstrswithf(char* a)
{
	while(*a != '\0')
	{
		if(*a == 's')
			*a = 'f';
		a++;
	}
	return a;
}

---