C string capitalize problem. I encounter bus error

I am making capitalized function. But when execute this code, the bus error occur. Is there anyone can debug this? I really need your help!! please help me . I am computer programming novice without c knowledge.

#include <stdio.h>
void    up(char *c)
{
    if((*c < ‘z’) && (*c > ‘a’))
    {
        *c -= 32;
    }
}
char    *ft_strcapitalize(char *str)
{
    int i;
    i=0;
    while (str[i])
    {
            up(&str[i]);
        i++;
    }
    return str;
}
int main()
{
    char *str = “salut, comment tu vas ? 42mots quarante-deux cinquante”;
    ft_strcapitalize(str);
    printf(“%s”, str);
}

This solution should work for you.

#include <stdio.h>

void up(char *c)
{
    if (!c)
        return;
    if((*c <= 'z') && (*c >= 'a'))
        *c -= 32;
}

char *ft_strcapitalize(char *str)
{
    int i;

    for (i = 0; str[i]; i++)
        up(&str[i]);
    return str;
}

int main()
{
    char str[] = "salut, comment tu vas ? 42mots quarante-deux cinquante";

    ft_strcapitalize(str);
    printf("%s\n", str);
    return 0;
}