Add C file test

tests/syntax-tests/source/C/test.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+void test_function()
+{
+#define TEST
+#ifdef TEST
+    printf("TEST is defined\n");
+#endif
+}
+
+struct Node
+{
+    int val;
+    struct Node *next;
+};
+
+int main(int argc, char **argv)
+{
+    /* This C program was written to help bat
+     * with its syntax highlighting tests
+     */
+
+    // Calling test function
+    test_function();
+    struct Node *head = NULL;
+    head = (struct Node *)malloc(sizeof(struct Node *));
+    head->val = -1;
+    if (head->val == 1 * -1)
+    {
+        head->val = 10;
+    }
+    else
+    {
+        head->val = argc;
+    }
+    int t = head->val, count = 0;
+    free(head);
+    while (t--)
+    {
+        count++;
+    }
+    for (int i = t; i < count; ++i)
+    {
+        do
+        {
+            --count;
+        } while (false);
+    }
+    enum chars
+    {
+        M,
+        I,
+        T,
+        H,
+        L
+    };
+    char *string = "string";
+    printf("true is #define true %d\n", true);
+    return 0;
+}