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Factorial

+#include <stdio.h>
+#include <stdlib.h>
+
+int* factorise (int N){
+    int i = 0;
+    int n = N;
+    int* fact = malloc((N-1) * sizeof(int));
+    
+    for (int k = 2 ; k <= N ; k++){
+        
+        while (n % k == 0){
+            n = n / k;
+            fact[i] = k;
+            i++;
+        }
+        
+    }
+    
+    return fact;
+}
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