type in eigen solver creator corrected

src/amdis/linear_algebra/eigen/SolverCreator.hpp

@@ -30,7 +30,7 @@ namespace AMDiS
     using SolverBase = LinearSolverInterface<Matrix, VectorX, VectorB>;
     using Scalar = typename Matrix::Scalar;
 
-    virtual std::unique_ptr<SolverBase> create(std::string const& prefix) override
+    virtual std::unique_ptr<SolverBase> create(std::string prefix) override
     {
       // get creator string for preconditioner
       std::string precon = "no";
@@ -62,7 +62,7 @@ namespace AMDiS
     using IncompleteCholesky =
       SolverCreator<Eigen::IncompleteCholesky<Scalar, Eigen::Lower|Eigen::Upper, Ordering>>;
 
-    std::unqiue_ptr<SolverBase> createIncompleteCholesky(std::string const& prefix) const
+    std::unique_ptr<SolverBase> createIncompleteCholesky(std::string const& prefix) const
     {
       std::string ordering = "amd";
       Parameters::get(prefix + "->precon->ordering", ordering);