[BUG] Simple QP example in C not compiling

[mtanneau]

Describe the bug

The simple_qp_example.c example fails to compile.
I obtain the following error message:

docs/cuopt/source/cuopt-c/lp-milp/examples/simple_qp_example.c: In function 'test_simple_qp':
docs/cuopt/source/cuopt-c/lp-milp/examples/simple_qp_example.c:133:40: error: passing argument 16 of 'cuOptCreateQuadraticProblem' from incompatible pointer type [-Wincompatible-pointer-types]
  133 |                                        variable_types,
      |                                        ^~~~~~~~~~~~~~
      |                                        |
      |                                        char *
In file included from docs/cuopt/source/cuopt-c/lp-milp/examples/simple_qp_example.c:25:
~/miniconda3/envs/cuopt_dev/include/cuopt/linear_programming/cuopt_c.h:311:29: note: expected 'void **' but argument is of type 'char *'
  311 |   cuOptOptimizationProblem* problem_ptr);
      |   ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
docs/cuopt/source/cuopt-c/lp-milp/examples/simple_qp_example.c:118:12: error: too many arguments to function 'cuOptCreateQuadraticProblem'
  118 |   status = cuOptCreateQuadraticProblem(num_constraints,
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
~/miniconda3/envs/cuopt_dev/include/cuopt/linear_programming/cuopt_c.h:295:13: note: declared here
  295 | cuopt_int_t cuOptCreateQuadraticProblem(
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Note that the error occurs because the call to cuOptCreateQuadraticProblem should not include variable types (i.e. continuous vs integer vs binary) here:

cuopt/docs/cuopt/source/cuopt-c/lp-milp/examples/simple_qp_example.c

Line 133 in 787243b

variable_types,

Steps/Code to reproduce bug

• Checkout main branch
• Build cuopt from source
• Compile

  gcc -I . -L . -o simple_qp docs/cuopt/source/cuopt-c/lp-milp/examples/simple_qp_example.c -lcuopt

Expected behavior

The example should compile without error, and the executable should execute as expected.

Environment details (please complete the following information):

• Environment location: DGX Spark workstation
• Method of cuOpt install: from source using conda (via miniconda as specified in official instructions)

Additional context

Add any other context about the problem here.