Write the following code in RISC-V assembly. Be sure to follow C calling conventions.

int atoi(const char *s) {

int value = 0;

int mul = 1;

if (!s)

return 0;

if (*s == '+')

++s;

if (*s == '-') {

++s;

mul = -1;

}

while (*s) {

value = value * 10 + (*s - '0');

++s;

}

return value * mul;

}

This function converts a character string to an integer value.