fix memory issue when aevol_create is called providing a sequence file

introduced by ad7fef6b

src/aevol_create.cpp

@@ -91,10 +91,10 @@ int main(int argc, char* argv[]) {
       exit(EXIT_FAILURE);
     }
     lchromosome = strlen(raw_chromosome) - 1;
-    chromosome = new char[lchromosome]; // Warning: will become the DNA of the
-                                        // first individual created -> do not
-                                        // delete, will be freed in Dna
-    strncpy(chromosome, raw_chromosome, lchromosome);
+    chromosome = new char[lchromosome + 1]; // Warning: will become the DNA of the
+                                            // first individual created -> do not
+                                            // delete, will be freed in Dna
+    strncpy(chromosome, raw_chromosome, lchromosome + 1);
     printf("Loading chromosome from text file %s (%" PRId32 " base pairs) \n",
         chromosome_file_name, lchromosome);
     fclose(chromosome_file);