can someone explain this to me I am having a hard time understanding it

eanonymous/SteelblueHighAssignments C No description run share D main.c E O history #include unistd.h gcc ve 2 3 void ft_putchar(char c) 15 write(1 , sc,1); 7 8 void ft putnbr(int nb) 10 | if (nb 0) 16 17 ft-putchar(nb % 10 + 48); 18 19 0' 20 21 22 int main() 23 24 ft_putnbr(-32); 25 return (0)1 26 ft_putchar) nb -nb 1: ft putnbr(nb 10)