fuzz: Initial fuzz_target.c (#1273)

* Initial fuzz_target.c

* Update Fuzz/fuzz_target.c

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update Fuzz/fuzz_target.c

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Fuzz/fuzz_target.c

@@ -0,0 +1,39 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "pavl.h"
+#include "sort.h"
+#include "local_proto.h"
+#include "test_simulation.cpp"
+#include "test_treatments.cpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    if (size < sizeof(int))
+        return 0;
+
+    int input = *(int *)data;
+
+    // fuzz test for pavl_create function from pavl.h
+    struct pavl_table *table = pavl_create(NULL, NULL, NULL);
+    if (table) {
+        pavl_destroy(table, NULL);
+    }
+
+    // fuzz test for Mergesort_increasing_smallest_azimuth function from sort.h
+    struct node head;
+    struct node tail;
+    Mergesort_increasing_smallest_azimuth(&head, &tail);
+
+    // Fuzz test for functions from local_proto.h
+    float result = f_and(input, input, E);
+    result += f_or(input, input, E);
+    result += f_not(input, E);
+
+    // Fuzz test for test_simulation.cpp
+    ret += test_calling_all_functions();
+
+    // Fuzz test for test_treatments.cpp
+    ret += test_steering();
+
+    return 0;
+}