utils.c


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#include <string.h>
#include <assert.h>
#include <stdlib.h>

char *str_delete_at(const char *str, const int pos)
{
    char *tmp = malloc(sizeof(char) * (strlen(str) + 1));
    assert(tmp != NULL);
    strcpy(tmp, str);

    int len = strlen(str);
    if (pos >= len)
        return tmp;

    for (int i = 0; i < len; ++i)
    {
        if (i >= pos)
            tmp[i] = tmp[i + 1];
    }

    return tmp;
}

size_t str_count_occ(const char *str, const char ch)
{
    size_t count = 0;
    for (int i = 0; str[i] != '\0'; ++i)
    {
        if (str[i] == ch)
            count += 1;
    }
    return count;
}

/* Return random integer between lower bound bound_l (inclusive) and upper bound bound_u (exclusive) */
int int_rand(const int bound_l, const int bound_u)
{
    return bound_l + (rand() % bound_u);
}