Added multiset

examples/multiset/README.md

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+# Multiset examples
+
+* prime_cof.c - Prime factorization of a number.

examples/multiset/prime_cof.c

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+#include <stdio.h>
+#include "multiset.h"
+
+MULTISET_GENERATE(ms, multi_set, /* FMOD */, size_t)
+
+int cmp(size_t a, size_t b)
+{
+    if (a > b)
+        return 1;
+    else if (a < b)
+        return -1;
+    return 0;
+}
+
+void prime_cof(const size_t number)
+{
+    multi_set *mset = ms_new(cmp);
+
+    size_t num = number;
+
+    for (size_t i = 2; num != 1; i++)
+    {
+        while (num % i == 0)
+        {
+            ms_insert(mset, i);
+            num /= i;
+        }
+    }
+
+    printf("The factorization of %llu is given by:\n", number);
+
+    multi_set_iter iter;
+    size_t result, mul, index;
+    for (ms_iter_new(&iter, mset); !ms_iter_end(&iter);)
+    {
+        if (!ms_iter_next(&iter, &result, &mul, &index))
+        {
+            printf("ERROR\n");
+            break;
+        }
+
+        if (ms_count(mset) == 1)
+            printf("(%llu^%llu)\n", result, mul);
+        else if (index == 0)
+            printf("(%llu^%llu ", result, mul);
+        else if (index == ms_count(mset) - 1)
+            printf("* %llu^%llu)\n", result, mul);
+        else
+            printf("* %llu^%llu ", result, mul);
+    }
+
+    printf("Set Cardinality: %llu\n\n", ms_cardinality(mset));
+
+    ms_free(mset);
+}
+
+int main(int argc, char const *argv[])
+{
+    prime_cof(360);
+    prime_cof(55777680);
+    prime_cof(4294967296);
+    prime_cof(31415926535);
+    prime_cof(27182818284);
+    prime_cof(16180339887);
+
+    return 0;
+}