1 files changed, 39 insertions, 0 deletions
diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..dff3b3f
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,39 @@
+#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);
+}